II-VI INC
10-Q, 1999-05-13
OPTICAL INSTRUMENTS & LENSES
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                              FORM 10-Q


                  SECURITIES AND EXCHANGE COMMISSION
                        WASHINGTON, D.C. 20549


[X]  Quarterly Report under Section 13 or 15(d) of the Securities 
     Exchange Act of 1934

         For the quarterly period ended March 31, 1999

[ ]  Transition report pursuant to Section 13 or 15(d) of the 
     Securities Exchange Act of 1934 for the transition period 
     from         to       .
          -------    -----

                   Commission File Number:  0-16195


                          II-VI INCORPORATED
        (Exact name of registrant as specified in its charter)

 PENNSYLVANIA                                 25-1214948
(State or other                           (I.R.S. Employer
jurisdiction of                          Identification No.)
incorporation or 
or organization)


375 Saxonburg Boulevard
    Saxonburg, PA                               16056
(Address of principal 
executive offices)                            (Zip Code)

Registrant's telephone number, including area code:  724-352-4455

Indicate by check mark whether the registrant  (1) has filed all reports 
required to be filed by Section 13 or 15(d) of the Securities Exchange 
Act of 1934 during the preceding 12 months (or for such shorter period 
that the registrant was required to file such reports), and  (2) has 
been subject to such filing requirements for the past 90 days.

                       Yes  x  No 
                           ---    ---
Indicate the number of shares outstanding of each of the issuer's 
classes of common stock as of the latest practicable date:

       At May 7, 1999, 6,859,966 shares of Common Stock, no par 
       value, of the registrant were outstanding.







                  II-VI INCORPORATED AND SUBSIDIARIES


                                  INDEX



                                                                Page No.
                                                                --------

PART 1 - FINANCIAL INFORMATION

         Item 1.  Financial Statements:

                  Independent Accountants' Report . . . . . . . .      3

                  Condensed Consolidated Balance Sheets 
                  - March 31, 1999 and June 30, 1998. . . . . . .      4

                  Condensed Consolidated Statements of Earnings 
                  -- Three and nine months ended March 31, 1999 
                  and 1998. . . . . . . . . . . . . . . . . . . .      5

                  Condensed Consolidated Statements of Cash Flows 
                  -- Nine months ended March 31, 1999
                  and 1998. . . . . . . . . . . . . . . . . . . .      7

                  Notes to Condensed Consolidated 
                  Financial Statements. . . . . . . . . . . . . .      8


         Item 2.  Management's Discussion and Analysis 
                  of Financial Condition and 
                  Results of Operations . . . . . . . . . . . . .     11


         Item 3.  Quantitative and Qualitative Disclosures
                  About Market Risk (no significant changes
                  since June 30, 1998)


PART II - OTHER INFORMATION

          Item 6. Exhibits and Reports on Form 8-K. . . . . . . .     13




                                    2
















INDEPENDENT ACCOUNTANTS' REPORT

To the Board of Directors and Shareholders of
II-VI Incorporated and Subsidiaries:

We have reviewed the accompanying condensed consolidated balance sheet 
of II-VI Incorporated and Subsidiaries as of March 31, 1999, and the 
related condensed consolidated statements of earnings for the three-
month and nine-month periods ended March 31, 1999 and 1998, and the 
related condensed consolidated statements of cash flows for the nine-
month periods ended March 31, 1999 and 1998.  These financial statements 
are the responsibility of the Company's management.  

We conducted our review in accordance with standards established by the 
American Institute of Certified Public Accountants.  A review of interim 
financial information consists principally of applying analytical 
procedures to financial data and of making inquiries of persons 
responsible for financial and accounting matters.  It is substantially 
less in scope than an audit conducted in accordance with generally 
accepted auditing standards, the objective of which is the expression of 
an opinion regarding the financial statements taken as a whole.  
Accordingly, we do not express such an opinion.

Based on our review, we are not aware of any material modifications that 
should be made to such condensed consolidated financial statements for 
them to be in conformity with generally accepted accounting principles.

We have previously audited, in accordance with generally accepted 
auditing standards, the consolidated balance sheet of II-VI Incorporated 
and Subsidiaries as of June 30, 1998, and the related consolidated 
statements of earnings, shareholders' equity and cash flows for the year 
then ended (not presented herein); and in our report dated August 7, 
1998, we expressed an unqualified opinion on those consolidated 
financial statements.  In our opinion, the information set forth in the 
accompanying condensed consolidated balance sheet as of June 30, 1998 is 
fairly stated, in all material respects, in relation to the consolidated 
balance sheet from which it has been derived.


/s/ Deloitte & Touche LLP
Pittsburgh, Pennsylvania
April 21, 1999


                                    3







                   PART 1 - FINANCIAL INFORMATION
Item 1.  Financial Statements:

II-VI Incorporated and Subsidiaries
Condensed Consolidated Balance Sheets (Unaudited)
($000)
                                               March 31,        June 30,
Assets                                           1999             1998
                                               ---------        --------
Current Assets
  Cash and cash equivalents                    $  4,483         $  4,160
  Accounts receivable - net                      10,779           11,018
  Inventories                                     9,380           10,056
  Other current assets                            1,475            1,998
                                                -------          -------
    Total Current Assets                         26,117           27,232

Property, Plant and Equipment, net               36,537           35,887
Other Assets                                      4,990            4,655
                                                -------           ------
                                                $67,644          $67,774
                                                =======          =======
Liabilities and Shareholders' Equity

Current Liabilities
  Notes payable                                 $ 5,145          $ 5,833
  Accounts payable                                1,204            2,810
  Accrued salaries, wages and bonuses             2,255            2,972
  Accrued profit sharing contribution               404              711
  Other current liabilities                       1,835            1,418
  Current portion of long-term debt                  42               68
                                                -------          -------
    Total Current Liabilities                    10,885           13,812

Long-Term Debt--less current portion              2,568            2,308

Other Liabilities, 
  primarily deferred income taxes                 2,287            1,591

Commitments & Contingencies                           -                -

Shareholders' Equity
  Preferred stock, no par value; authorized -
  5,000,000 shares; unissued                          -                -
  Common stock, no par value; 
  authorized - 30,000,000 shares;
  issued - 6,859,966 shares at March 31, 1999;
  6,834,786 shares at June 30, 1998              18,660           18,468
  Accumulated other comprehensive income           (197)             435
  Retained earnings                              35,351           31,922
                                                -------          -------
                                                 53,814           50,825

Less treasury stock, at cost 
  - 534,440 shares at March 31, 1999;
  384,440 shares at June 30, 1998                 1,910              762
                                                -------          -------
                                                 51,904           50,063
                                                -------          -------
                                                $67,644          $67,774
                                                =======          =======

- -See notes to condensed consolidated financial 
statements.

                                    4



II-VI Incorporated and Subsidiaries
Condensed Consolidated Statements of Earnings (Unaudited)
($000 except per share data)

                                                  Three Months Ended
                                                       March 31,
                                               1999             1998
                                            --------         --------
Revenues

Net sales:
  Domestic                                  $  8,109         $  7,954
  International                                7,151            7,781
                                            --------         --------
                                              15,260           15,735
Contract research and development                278              495
                                            --------         --------
                                              15,538           16,230
                                            --------         --------

Costs, Expenses & Other (Income) Expense 

Cost of goods sold                             8,792            9,101
Contract research and development                146              382
Internal research and development                617              516
Selling, general and administrative            3,592            3,727
Interest expense                                  61               64
Other expense (income) - net                     107             (105)
                                            --------         --------
                                              13,315           13,685
                                            --------         --------

Earnings Before Income Taxes                   2,223            2,545

Income Taxes                                     725              762
                                            --------         --------

Net Earnings                                $  1,498         $  1,783
                                            ========         ========

Basic Earnings Per Share                    $   0.24         $   0.28
                                            ========         ========

Diluted Earnings Per Share                  $   0.23         $   0.27
                                            ========         ========

- -See notes to condensed consolidated financial statements.

                                    5


II-VI Incorporated and Subsidiaries
Condensed Consolidated Statements of Earnings (Unaudited)
($000 except per share data)
                                                 Nine Months Ended
                                                     March 31,
                                               1999             1998
                                            --------         --------
Revenues

Net sales:
  Domestic                                  $ 23,833         $ 23,764
  International                               19,732           21,232
                                            --------         --------
                                              43,565           44,996
Contract research and development                976            1,811
                                            --------         --------
                                              44,541           46,807
                                            --------         --------

Costs, Expenses & Other (Income) Expense

Cost of goods sold                            26,838           25,204
Contract research and development                686            1,376
Internal research and development              1,769            1,161
Selling, general and administrative           10,035           10,829
Interest expense                                 341               91
Other (income) expense - net                    (173)              51
                                            --------         --------
                                              39,496           38,712
                                            --------         --------

Earnings Before Income Taxes                   5,045            8,095

Income Taxes                                   1,616            2,416
                                            --------         --------

Net Earnings                                $  3,429         $  5,679
                                            ========         ========

Basic Earnings Per Share                    $   0.54         $   0.88
                                            ========         ========

Diluted Earnings Per Share                  $   0.53         $   0.85
                                            ========         ========

- -See notes to condensed consolidated financial statements.

                                    6




II-VI Incorporated and Subsidiaries
Condensed Consolidated Statements of Cash Flows (Unaudited)
($000)

                                                     Nine Months Ended
                                                         March 31,
                                                       1999       1998
                                                    --------   --------
Cash Flows from Operating Activities
  Net earnings                                      $  3,429   $  5,679
  Adjustments to reconcile net earnings to net 
  cash provided by operating activities:
    Depreciation and amortization                      3,645      3,073
    (Gain) loss on foreign currency transactions        (216)       383
    Writedown of property held for sale                  200          -
    Deferred income taxes                                240        (31)
    Increase (decrease) in cash from changes in:
      Accounts receivable                                692     (3,337)
      Inventories                                        810     (2,308)
      Accounts payable                                (1,930)      (118)
      Other operating net assets                         155     (1,694)
                                                    --------   --------
Net cash provided by operating activities              7,025      1,647
                                                    --------   --------

Cash Flows from Investing Activities
  Additions to property, plant and equipment          (4,051)   (16,932)
  (Additions to) disposals of other assets              (600)         2
                                                    --------   --------
  Net cash used in investing activities               (4,651)   (16,930)
                                                    --------   --------

Cash Flows from Financing Activities
  (Payments on) proceeds from 
  short-term borrowings, net                            (729)     4,467
  (Payments on) proceeds from long-term borrowings       (22)     1,933
  Proceeds from sale of common stock                     151        406
  Purchase of treasury stock                          (1,148)         -
                                                    --------   --------
  Net cash (used in) provided by 
  financing activities                                (1,748)     6,806

  Effect of exchange rate changes on cash and 
  cash equivalents                                      (303)      (241)
                                                    --------   --------

Net increase (decrease) in cash 
and cash equivalents                                     323     (8,718)

Cash and Cash Equivalents at Beginning of Period       4,160     10,854
                                                    --------   --------

Cash and Cash Equivalents at End of Period          $  4,483   $  2,136
                                                    ========   ========

Cash paid for interest                              $    304   $     54
                                                    ========   ========

Cash paid for income taxes                          $    773   $  2,919
                                                    ========   ========

- -See notes to condensed consolidated financial statements.

                                    7


II-VI Incorporated and Subsidiaries
Notes to Condensed Consolidated Financial Statements  (Unaudited)

Note A  - Basis of Presentation

The consolidated financial statements for the three and nine 
month periods ended March 31, 1999 and 1998 are unaudited. In 
the opinion of management, all adjustments (consisting of 
normal recurring accruals) considered necessary for a fair 
presentation for the periods presented have been included. 
These interim statements should be read in conjunction with the 
audited consolidated financial statements and footnotes thereto 
contained in the Company's 1998 Annual Report to shareholders. 
The consolidated results of operations for the three and nine 
month periods ended March 31, 1999 and 1998 are not necessarily 
indicative of the results to be expected for the full year.


Note B  - Inventories  ($000)

The components of inventories are as follows:

                      March 31,         June 30,
                        1999              1998
                      ---------         --------

Raw materials         $  2,684          $  3,220
Work in progress         4,252             3,633
Finished goods           2,444             3,203
                      ---------         --------
                      $  9,380          $ 10,056
                      =========         ========


Note C  - Property, Plant and Equipment  ($000)

Property, plant and equipment consist of the following:

                               March 31,         June 30,
                                 1999              1998
                               ---------         --------

Land and land improvements     $  1,551          $  1,501
Buildings and improvements       19,348            16,951
Machinery and equipment          39,584            37,980
                               ---------         --------
                                 60,483            56,432

Less accumulated depreciation    23,946            20,545
                               ---------         --------
                               $ 36,537          $ 35,887
                               =========         ========


                                    8

II-VI Incorporated and Subsidiaries
Notes to Consolidated Financial Statements (Unaudited), Continued

Note D  - Debt

On December 31, 1997, the Company entered into a $10.0 million 
unsecured line of credit agreement with PNC Bank, which was 
scheduled to expire December 30, 1998.  The Company received an 
extension of the expiration date from the bank to March 31, 
1999.  

On March 26, 1999, the Company replaced its $10.0 million 
unsecured line of credit agreement by entering into a $15.0 
million unsecured committed line of credit agreement with PNC 
Bank that expires on March 25, 2000.  This line of credit may 
be extended for an additional two years.  The average interest 
rate in effect as of March 31, 1999 was 5.88%.  As of March 31, 
1999, the total borrowings under this line of credit were $5.0 
million.  The Company is subject to certain restrictive 
covenants under this agreement.
  


Note E  - Earnings Per Share

The following table sets forth the computation of earnings per 
share for the periods indicated:

                             Three Months Ended         Nine Months Ended
                                   March 31,                 March 31,
(000 except per share data)  1999          1998         1999        1998
- -------------------------------------------------------------------------
Net earnings                 $1,498      $1,783         $3,429    $5,679
Divided by:
  Weighted average shares     6,323       6,445          6,368     6,433
- -------------------------------------------------------------------------
Basic earnings per share     $ 0.24      $ 0.28         $ 0.54    $ 0.88
- -------------------------------------------------------------------------
Net earnings                 $1,498      $1,783         $3,429    $5,679
Divided by:
  Weighted average shares     6,323       6,445          6,369     6,433
  Dilutive effect of common 
    stock equivalents           137         232            137       245
- -------------------------------------------------------------------------
  Diluted weighted average 
    common shares             6,460       6,677          6,506     6,678
- -------------------------------------------------------------------------
Diluted earnings per share   $ 0.23      $ 0.27         $ 0.53    $ 0.85
- -------------------------------------------------------------------------


                                    9

II-VI Incorporated and Subsidiaries
Notes to Consolidated Financial Statements (Unaudited), Continued

Note F  - Other Comprehensive Income

During the quarter ended September 30, 1998, the Company 
adopted Statement of Financial Accounting Standards No. 130, 
"Reporting Comprehensive Income" which requires the Company to 
report and disclose a measure ("comprehensive income") of all 
changes in shareholders' equity that result from transactions 
and other economic events of the period other than transactions 
with owners.

The components of comprehensive income, net of related tax, 
were as follows for the periods indicated ($000):

Three Months Ended March 
31,

                           Three Months Ended      Nine Months Ended
                                March 31,               March 31,
                           ------------------      ----------------
                             1999        1998        1999       1998
                           ------      ------      ------     ------
Net earnings               $1,498      $1,783      $3,429     $5,679
Cumulative translation
  adjustments                (133)        163        (632)       171
                           ------      ------      ------     ------
Comprehensive income       $1,365      $1,946      $2,797     $5,850
                           ======      ======      ======     ======



                                    10




















Item 2.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND 
         ---------------------------------------------------------------
         RESULTS OF OPERATIONS
         ---------------------

Results of Operations
- ---------------------

Net earnings for the third quarter of fiscal 1999, ended March 31, 1999 
were $1,498,000 ($0.23 per share-diluted) on revenues of $15,538,000.  
This compares to net earnings of $1,783,000 ($0.27 per share-diluted) on 
revenues of $16,230,000 in the third quarter of fiscal 1998.  For the 
nine months ended March 31, 1999, net earnings were $3,429,000 ($0.53 
per share-diluted) on revenues of $44,541,000.  This compares with net 
earnings of $5,679,000 ($0.85 per share-diluted) on revenues of 
$46,807,000 for the same period last fiscal year.

Order bookings for the third quarter of fiscal 1999 were $14,655,000 
compared to $16,083,000 for the same period last year, a decrease of 9%.  
Year-to-date order bookings for 1999 decreased 10% to $43,959,000 from 
$48,958,000 for the same period last year.  Year-to-date manufacturing 
bookings decreased 10% to $43,718,000 from $48,455,000 last fiscal year.  
For the quarter, the manufacturing bookings decrease was attributable to 
decreased bookings at the Company's VLOC subsidiary and at the Company's 
eV PRODUCTS division.  Bookings of infrared optics and material products 
increased by approximately 5%.  For the year-to-date, approximately 75% 
of the decrease in manufacturing bookings was attributable to bookings 
at the Company's VLOC subsidiary and the remaining decrease was 
attributable to bookings of infrared optics and material products. 

Revenues for the third quarter of fiscal 1999 decreased 4% to 
$15,538,000 compared to $16,230,000 for the same period last year.  
Year-to-date revenues for fiscal 1999 decreased 5% to $44,541,000 from 
$46,807,000 for the same period last year.  For both the quarter and 
year-to-date, the decrease was related equally to decreased shipments of 
infrared optics and material products and decreased shipments at the 
Company's VLOC subsidiary.  These decreases were offset by increases in 
shipments at the Company's eV PRODUCTS division of approximately 40% for 
the quarter and approximately 15% for the year-to-date.

Manufacturing gross margin for the third quarter of fiscal 1999 was 
$6,468,000 or 42% of revenues compared to $6,634,000 or 42% of revenues 
for the same period last year.  Year-to-date for fiscal 1999, 
manufacturing gross margin was $16,727,000 or 38% of revenues compared 
to $19,792,000 or 44% of revenues for the same period last year.  The 
lower gross margin percentage for the year-to-date reflects higher per 
unit costs at the Company's VLOC subsidiary and continued price 
sensitivity in the infrared optics and materials market.  The 
manufacturing gross margin percentage has increased from 34% of revenues 
in the first quarter of fiscal 1999 to 42% of revenues in the third 
quarter of fiscal 1999 and reflects increases in every product line.

Internal research and development expenses for the third quarter of 
fiscal year 1999 were $617,000 or 4% of revenues compared to $516,000 or 
3% of revenues for the same period last year.  Year-to-date for fiscal 
1999, internal research and development expenses were $1,769,000 or 4% 
of revenues compared to $1,161,000 or 2% of revenues for the same period 
last year.  The increased expense for the quarter and year-to-date is 
the result of internally funded projects associated with the development 
of new materials to improve and expand product offerings, as well as 
continued efforts to improve material growth yields.

Selling, general and administrative expenses for the third quarter of 
fiscal 1999 were $3,592,000 or 23% of revenues compared to $3,727,000 or 
23% of revenues for the same period last year.  Year-to-date for fiscal 
1999, selling, general and administrative expenses were $10,035,000 or 
23% of revenues compared to $10,829,000 or 23% of revenues for the same 
period last year.  The dollar decreases for the quarter and year-to-date 
reflect planned discretionary cost reductions, decreased expense 
associated with the Company's worldwide profit-driven bonus programs and 
improved utilization of existing personnel and resources.

Interest expense for the third quarter of fiscal 1999 was $61,000 
compared to $64,000 for the same period last year.  Year-to-date for 
fiscal 1999, interest expense was $341,000 compared to $91,000 for the 
same period last year.  The year-to-date fluctuation is the direct 
result of increased borrowings.

Other expense for the third quarter of fiscal 1999 was $107,000 compared 
to other income of $105,000 for the same period last year.  Year-to-date 
for fiscal 1999, other income was $173,000 compared to other expense of 
$51,000 for the same period last year.  The quarter fluctuation was 
primarily the result of foreign currency translation losses.  The year-


                                   11

to-date fluctuation was the result of foreign currency translation gains 
offset by the writedown of certain assets held for sale.

For fiscal 1999, the Company's year-to-date effective income tax rate 
was 32% which was higher than the 30% income tax rate for the same 
period last fiscal year.  The increase in the effective income tax rate 
is the result of higher state income taxes and lower earnings from 
certain foreign subsidiaries.


Liquidity and Capital Resources
- -------------------------------

Cash increased during the first nine months of fiscal 1999 by $323,000 
primarily due to net earnings before depreciation and amortization of 
$7,074,000 and reductions of accounts receivable and inventories 
totaling $1,502,000.  This increase was offset by $4,051,000 in capital 
expenditures, a reduction of accounts payable of $1,930,000 due to 
payment of amounts in the normal course of business, the repurchase of 
150,000 shares of the Company's common stock, repayment of short-term 
borrowings and payment of compensation costs relating to the Company's 
fiscal 1998 worldwide profit-driven bonus programs.

The Company generated $7,025,000 in cash from operations for the first 
nine months of fiscal 1999.  The $7,074,000 in cash generated from net 
earnings before depreciation and amortization for the nine months ended 
March 31, 1999 and reductions of accounts receivable and inventories 
were offset by a reduction of accounts payable in the normal course of 
business and the payment of compensation costs relating to the Company's 
fiscal 1998 worldwide profit-driven bonus programs.

The Company has a $15.0 million unsecured committed line of credit with 
PNC Bank that expires on March 25, 2000.  This line of credit may be 
extended for an additional two years.

The current cash balance and the existing credit facility, as well as 
cash to be provided by operations during the remainder of fiscal year 
1999, will be used for working capital needs, further capital 
expenditures for facilities and equipment, scheduled debt payments, and 
possible acquisitions of complementary businesses, products, or 
technologies.


Other Matters
- -------------

The "Year 2000" issue concerns the potential exposures related to the 
automated generation of business and financial misinformation resulting 
from the use of computer programs which have been written using two 
digits, rather than four, to define the applicable year of business 
transactions.

The Company has developed a formal plan to address the Year 2000 
implications of its information technology and noninformation technology 
systems.  The first phase of this plan is complete and consisted of an 
evaluation of the systems impacted by the Year 2000 issue.  The second 
phase of this plan is substantially completed and consisted of an 
evaluation of the third parties with whom the Company has significant 
relations and their Year 2000 compliance.  The last phase of this plan 
will be the implementation of corrective measures deemed necessary, as 
identified during the first two stages of the plan.  This phase has 
begun and is expected to be completed by June 30, 1999.

Based upon the information obtained from the first two stages of the 
plan, the Company does not believe its information technology and 
noninformation technology systems will experience significant Year 2000 
problems.  However, there can be no assurance that the third parties 
with whom the Company has significant relations will not experience 
disruptions in their business that could have a material adverse affect 
on the Company.   An example of a worst case scenario caused by the Year 
2000 issue would be the failure in the accounting systems of a 
significant number of the Company's key customers which resulted in a 
delay in the payment of invoices issued by the Company.

To date, the Company has spent approximately $150,000 on the Year 2000 
issue and believes that the remaining potential cost related to the Year 
2000 issue will range between $150,000 and $250,000.

Although the Company has developed and expects to execute the plan 
described above, due to the inherent uncertainty and complexity involved 
with the Year 2000 issue, there can be no assurance that the Company 
will address all aspects of the Year 2000 issue.  A contingency plan is 
expected to be developed by June 30, 1999.


                                   12

This Management's Discussion and Analysis contains forward looking 
statements as defined by Section 21E of the Securities Exchange Act of 
1934, as amended, including the statements regarding the Company's 
ability to fund future working capital needs, capital expenditures, 
scheduled debt payments and possible acquisitions and the Company's plan 
to address the Year 2000 issue.  Actual results could differ from such 
statements if worldwide economic conditions change, competitive 
conditions intensify, technology problems emerge, and/or if suitable 
acquisitions cannot be consummated.  There are additional risk factors 
that could affect the Company's business, results of operations or 
financial condition.  Investors are encouraged to review the risk 
factors set forth in the Company's 1998 Form 10-K as filed with the 
Securities and Exchange Commission on September 23, 1998.





                        PART II - OTHER INFORMATION
                        ---------------------------



Item 6.  EXHIBITS AND REPORTS ON FORM 8-K
         --------------------------------

         (a)  Exhibits.

              10.01  Agreement by and between PNC Bank,
                     National Association and 
                     II-VI Incorporated for Amended 
                     and Restated Letter Agreement
                     for Committed Line of Credit and 
                     Japanese Yen Term Loan            Filed herewith.

              15.01  Accountants' awareness letter 
                     dated May 13, 1999                Filed herewith.

              27.01  Financial Data Schedule           Filed herewith.


         (b)  Reports on Form 8-K.

              None.


                                   13







Pursuant to the requirements of the Securities Exchange Act of 1934, the 
registrant has duly caused this report to be signed on its behalf by the 
undersigned thereunto duly authorized.


                                    II-VI INCORPORATED
                                    (Registrant)




Date: May 13, 1999                   By:  /s/ Carl J. Johnson
                                           Carl J. Johnson
                                Chairman and Chief Executive Officer




Date: May 13, 1999                   By:  /s/ James Martinelli
                                           James Martinelli
                                 Treasurer & Chief Financial Officer

                                    14


































                               EXHIBIT INDEX
                               -------------



Exhibit No.
- -----------

     10.01  Agreement by and between PNC Bank,
            National Association and II-VI Incorporated
            for Amended and Restated Letter Agreement
            for Committed Line of Credit and Japanese
            Yen Term Loan                             Filed herewith.

     15.01  Accountants' awareness letter dated
            May 13, 1999                              Filed herewith.

     27.01  Financial Data Schedule                   Filed herewith.


              AMENDED AND RESTATED LETTER AGREEMENT

March 26, 1999


II-VI Incorporated 
375 Saxonburg Boulevard
Saxonburg, PA 16056
Attention:  James Martinelli 
            Treasurer and Chief Financial Officer


            Re:  $15,000,000 Committed Line of Credit 
                 237,000,000 Japanese Yen Term Loan


Gentlemen:
     
We are pleased to inform you that PNC Bank, National Association (the 
"Bank") has approved II-VI Incorporated's (the "Borrower") request for 
(i) a renewal, restatement and increase of its existing $10,000,000 
unsecured, committed line of credit (the "Existing Line of Credit"), as 
presently governed by the terms of that certain Letter Agreement dated 
September 25, 1997 (the "Existing Letter Agreement") and as evidenced by 
Borrower's $10,000,000 Committed Line of Credit Note to the Bank, dated 
September 25, 1997 (the "Existing Line Note") and (ii) a restatement of 
its existing 237,000,000 Japanese Yen rate protection term loan (the 
"Existing Rate Protection Term Loan"), as presently governed by the 
terms of the Existing Letter Agreement and as evidenced by Borrower's 
237,000,000 Rate Protection Term Note (Euro-Yen/Cap) to the Bank, dated 
September 25, 1997 (the "Existing Rate Protection Term Note").    Upon 
execution of this letter (the "Agreement"), the Existing Letter 
Agreement shall be deemed canceled and all of the indebtedness 
outstanding thereunder shall be governed by the terms and conditions of 
this Agreement and the Notes. All the details regarding your restated 
loans are outlined in the following sections of this Agreement.

1.    Defined Terms.   Words and terms used herein without definition 
shall have the respective meanings assigned thereto on Schedule I 
attached hereto. 

2.    The Line of Credit.

      (a)  Commitment.   The first credit facility covered by this 
Agreement is a committed revolving line of credit (the "Line of Credit") 
under which the Borrower may request and the Bank, subject to the terms 
and conditions of this letter, agrees to make advances ("Advances") in 
Dollars or Optional Currency to the Borrower from time to time under the 
Line of Credit until the Expiration Date, in an aggregate amount not to 
exceed at any time the Line of Credit Commitment minus the Letters of 
Credit Outstanding. Subject to the terms and conditions hereof, the 
Borrower shall have the right to borrow, repay and reborrow amounts 
under the Line of Credit until the Expiration Date; provided that 
principal amounts outstanding and all accrued unpaid interest under the 
Line of Credit shall be repaid in full on or before the Expiration Date.

(b)  Extension of Expiration Date  Borrower may request that the 
Expiration Date be extended for all or a portion of the Line of Credit 
Commitment to a date which is no later than the 364th day after the 
then-current Expiration Date; provided that (i) any such extension 
request shall be made in writing (an "Extension Request") by Borrower 
and delivered to the Bank no earlier than sixty (60) days prior to (but 
no later than thirty (30) days prior to) the then-current Expiration 
Date, and (ii) no more than two (2) such 364-day Extension Requests may 
be made by the Borrower. The Bank may, in its sole discretion without 
any obligation whatsoever, accept or reject such Extension Request by 
giving written notice to the Borrower no later than fifteen (15) days 
prior to the then-effective Expiration Date; provided that any failure 
by the Bank to so notify the Borrower shall be deemed a rejection by the 
Bank of such Extension Request and the Line of Credit Commitment will 
terminate (and the principal amount outstanding and all accrued and 
unpaid interest under the Line of Credit shall be due and payable in 
full) on the then-current Expiration Date.    If the Bank accepts such 
Extension Request, the Expiration Date shall be automatically extended 
to the date which is the 364th day after the then-current Expiration 
Date. 

Borrower acknowledges and agrees that (x) the Bank has not made any 
representations to the Borrower regarding its intent to agree to any 
extensions set forth in this Section, (y) the Bank shall have no 
obligation to extend the Expiration Date, and (z) the Bank's agreement 
to one extension shall not commit the Bank to any additional extensions.

(c)  Note.  The Borrower's obligation to repay the Advances shall be 
evidenced by an amended and restated promissory note (which shall amend 
and restate the Existing Line Note) in the form of Exhibit A attached 
hereto (the "Line of Credit Note"). 


(d)  Advance Procedures.  The Borrower may request Advances under the 
Line of Credit upon giving oral or written notice to the Bank by 11:00 
a.m. (Pittsburgh, Pennsylvania time) (i) on the day (which shall be a 
Business Day) of the proposed Advance, in the case of Advances bearing 
interest at the Base Rate Option, (ii) three (3) Business Days prior to 
the proposed Advance, in the case of Advances bearing interest at the 
Euro-Rate Option, or (iii) four (4) Business Days prior to the proposed 
Advance, in the case of Advances funded in an Optional Currency (which 
Advance must bear interest at the Euro-Rate Option); in each case 
specifying the date and the Dollar or Dollar Equivalent (if applicable) 
amount thereof, the Euro-Rate Interest Period pursuant to Section 2(g) 
of this Agreement (if applicable), and for Advances to be funded in an 
Optional Currency, the currency in which the Advance is to be funded.   
Any oral request for an Advance shall be followed promptly thereafter by 
the Borrower's written confirmation to the Bank.  The Borrower 
authorizes the Bank to accept telephonic requests for Advances, and the 
Bank shall be entitled to rely upon the authority of any person 
providing such instructions.    The Borrower hereby indemnifies and 
holds the Bank harmless from and against any and all damages, losses, 
liabilities, costs and expenses (including reasonable attorneys' fees 
and expenses) which may arise or be created by the acceptance of 
telephone requests or making Advances.  The Bank will enter on its books 
and records, which entry when made will be presumed correct, the date 
and amount of each Advance, the interest rate and interest period 
applicable thereto, as well as the date and amount of each payment.

(e)  Rate of Interest.    Each Advance outstanding under the Line of 
Credit will bear interest at a rate or rates per annum as may be 
selected by the Borrower from the interest rate options set forth below 
(except that no Advance to which the Base Rate Option shall apply may be 
made in an Optional Currency):

 (i)  Base Rate Option.  A rate of interest per annum (computed on the 
basis of a year of 365 or 366 days, as the case may be, and the actual 
number of days elapsed) equal to the sum of the Base Rate plus the 
Applicable Margin.   If and when the Prime Rate or the Federal Funds 
Effective Rate changes, the rate of interest with respect to any Advance 
to which the Base Rate Option applies will change automatically without 
notice to the Borrower, effective on the date of any such change.

(ii)  Euro-Rate Option.  A rate of interest per annum (computed on the 
basis of a year of 360 days and the actual number of days elapsed 
(provided that for Advances made in an Optional Currency for which a 365 
day basis is the only market practice available to the Bank, such rate 
shall be calculated on the basis of a year of 365 or 366 days, as the 
case may be, and the actual number of days elapsed) equal to the sum of 
the Euro-Rate plus the Applicable Margin, for the applicable Euro-Rate 
Interest Period.    The Euro-Rate shall be adjusted with respect to any 
Advance to which the Euro-Rate Option applies on and as of the effective 
date of any change in the Euro-Rate Reserve Percentage.  The Bank shall 
give prompt notice to the Borrower of the Euro-Rate as determined or 
adjusted in accordance herewith.

The foregoing notwithstanding, it is understood that the Borrower may 
select different Interest Rate Options to apply simultaneously to 
different portions of the Advances and may select up to seven (7) 
different Euro-Rate Interest Periods to apply simultaneously to 
different portions of the Advances bearing interest under the Euro-Rate 
Option.  In no event will the rate of interest hereunder exceed the 
maximum rate allowed by law.

(iii)  Euro-Rate Unascertainable or Unavailable.   If the 
Bank determines (which determination shall be final and conclusive) 
that, by reason of circumstances affecting the interbank eurodollar 
market generally, deposits in dollars (in the applicable amounts) are 
not being offered to banks in the interbank eurodollar market for the 
selected term, or adequate means do not exist for ascertaining the Euro-
Rate, then the Bank shall give notice thereof to the Borrower.  
Thereafter, until the Bank notifies the Borrower that the circumstances 
giving rise to such suspension no longer exist, (a) the availability of 
the Euro-Rate Option shall be suspended, and (b) the interest rate for 
all Advances then bearing interest under the Euro-Rate Option shall be 
converted at the expiration of the then current Euro-Rate Interest 
Period(s) to, and any new Advances shall be made at, the Base Rate 
Option.

(iv)  Illegality.   In addition, if, after the date of this Agreement, 
the Bank shall determine (which determination shall be final and 
conclusive) that any enactment, promulgation or adoption of or any 
change in any applicable law, rule or regulation, or any change in the 
interpretation or administration thereof by a governmental authority, 
central bank or comparable agency charged with the interpretation or 
administration thereof, or compliance by the Bank with any guideline, 
request or directive (whether or not having the force of law) of any 
such authority, central bank or comparable agency shall make it unlawful 
or impossible for the Bank to make or maintain or fund loans under the 
Euro-Rate Option, the Bank shall notify the Borrower.  Upon receipt of 
such notice, until the Bank notifies the Borrower that the circumstances 
giving rise to such determination no longer apply, (a) the availability 
of the Euro-Rate Option shall be suspended, and (b) the interest rate on 
all Advances then bearing interest under the Euro-Rate Option shall be 
converted to the Base Rate Option either (i) on the last day of the then 
current Euro-Rate Interest Period(s) if the Bank may lawfully continue 
to maintain Advances under the Euro-Rate Option to such day, or (ii) 
immediately if the Bank may not lawfully continue to maintain Advances 
under the Euro-Rate Option.

(f)  Default Rate.  After the principal amount of all or any part of 
the Advances shall have become due and payable, whether by acceleration 
or otherwise, and upon the occurrence and during the continuance of any 
Event of Default, all Advances and Reimbursement Obligations shall bear 
interest at a rate per annum, and the Letter of Credit Fee shall be 
increased by an amount, equal to 200 basis points (2%) per annum above 
the rate otherwise in effect (the "Default Rate").    The Default Rate 
shall continue to apply whether or not judgment shall be entered on the  
Line of Credit Note.    

(g)  Interest Rate Election.  Subject to the terms and conditions of 
this Agreement, at the end of each Euro-Rate Interest Period applicable 
to any Advance, the Borrower may renew the Euro-Rate Option applicable 
to such Advance or convert such Advance to the Base Rate Option; 
provided that, during any period in which any Event of Default (as 
hereinafter defined) has occurred and is continuing, any Advances 
bearing interest under the Euro-Rate Option shall, at the Bank's sole 
discretion, be converted at the end of the applicable Euro-Rate Interest 
Period to the Base Rate Option and the Euro-Rate Option will not be 
available to Borrower with respect to any new Advances until such Event 
of Default has been cured by the Borrower or waived by the Bank.  The 
Borrower shall notify the Bank of each election of an Interest Rate 
Option, each conversion from one Interest Rate Option to another, the 
amount of the Advances then outstanding to be allocated to each Interest 
Rate Option and where relevant the interest periods therefor.  In the 
case of converting to the Euro-Rate Option, such notice shall be given 
at least three (3) Business Days prior to the commencement of any Euro-
Rate Interest Period.   If no notice of conversion or renewal is timely 
received by the Bank, the Borrower shall be deemed to have converted 
such advance to the Base Rate Option.  Any such election shall be 
promptly confirmed by the Borrower in writing by such method as the Bank 
may require.

(h)  Optional Currencies. The Bank will determine the Dollar Equivalent 
amount of (i) proposed Advances or Letters of Credit to be denominated 
in an Optional Currency as of the requested Borrowing Date or date of 
issuance, as the case may be, (ii) outstanding Advances or Letters of 
Credit Outstanding denominated in an Optional Currency as of the last 
Business Day of each month, and (iii) outstanding Advances denominated 
in an Optional Currency as of the end of each Euro-Rate Interest Period 
(each such date under clauses (i) through (iii) a "Computation Date").

(i)  The Bank shall be under no obligation to make Advances or issue 
Letters of Credit requested by the Borrower which are denominated in an 
Optional Currency if Bank notifies the Borrower by 12:00 noon 
(Pittsburgh, PA time) three (3) Business Days prior to the Borrowing 
Date or date of issuance for such Advance or Letter of Credit that the 
Optional Currency is not then available for such Advances or Letter of 
Credit.  If the Borrower receives a notice described in the preceding 
sentence, the Borrower may, by notice to the Bank not later than 5:00 
p.m. (Pittsburgh, PA time) three (3) Business Days prior to the 
Borrowing Date or date of issuance for such Advance or Letter of Credit, 
withdraw the request for such Advance or Letter of Credit and the Bank 
shall not make such Advance or issue such Letter of Credit. If the 
Borrower does not withdraw such request before such time, the Borrower 
shall be deemed to have requested that the Advance or Letter of Credit 
shall be made in Dollars in an amount equal to the Dollar Equivalent 
amount of such Advance or Letter of Credit and shall bear interest under 
the Base Rate Option.

(ii)  If the Borrower delivers a notice requesting that the Bank renew 
the Euro-Rate Option with respect to an outstanding Advance denominated 
in an Optional Currency, the Bank shall be under no obligation to renew 
such Euro-Rate Option if Bank delivers to the Borrower a notice by 12:00 
noon (Pittsburgh, PA time) three (3) Business Days prior to the 
effective date of such renewal that it cannot continue to provide 
Advances in such Optional Currency.  If the Bank has so notified the 
Borrower that any such continuation of Advances denominated in an 
Optional Currency is not then available, any notice of renewal with 
respect thereto shall be deemed withdrawn, and such Optional Currency 
Advance shall be redenominated into a Base Rate Advance in Dollars with 
effect from the last day of the Euro-Rate Interest Period with respect 
to any such Optional Currency Advance.  The Bank will promptly notify 
the Borrower of any such redenomination, and in such notice, the Bank 
will state the aggregate Dollar Equivalent amount of the redenominated 
Optional Currency Advance as of the Computation Date with respect 
thereto.

(iii)  The Borrower shall pay to the Bank from time to time in Dollars 
the Bank's then in effect customary fees and administrative expenses 
payable with respect to Advances denominated in an Optional Currency or 
Letters of Credit issued in an Optional Currency as the Bank may 
generally charge or incur in connection with the funding, maintenance, 
modification (if any), assignment or transfer (if any), negotiation, and 
administration of Advances denominated in an Optional Currency or 
Letters of Credit issued in an Optional Currency.

(iv)  Notwithstanding anything contained herein to the contrary, the 
entire amount of principal of and interest on any Advance made in an 
Optional Currency shall be repaid in the same Optional Currency in which 
such Advance was made, provided, however, that if it is impossible or 
illegal for Borrower to effect payment of an Advance in the Optional 
Currency in which such Advance was made, or if Borrower defaults in its 
obligations to do so, the Bank may in its sole discretion permit such 
payment to be made (i) at and to a different location, subsidiary, 
affiliate or correspondent of the Bank, or (ii) in the Equivalent Amount 
of Dollars or (iii) in an Equivalent Amount of such other currency 
(freely convertible into Dollars) as the Bank may in its sole discretion 
designate.  Upon any events described in (i) through (iii) of the 
preceding sentence, Borrower shall make such payment and Borrower agrees 
to hold Bank harmless from and against any loss incurred by Bank arising 
from the cost to Bank of any premium, any costs of exchange, the cost of 
hedging and covering the Optional Currency in which such Advance was 
originally made, and from any change in the value of Dollars, or such 
other currency, in relation to the Optional Currency that was due and 
owing.  Such loss shall be calculated for the period commencing with the 
first day of the Euro-Rate Interest Period for such Advance and 
continuing through the date of payment thereof.  Without prejudice to 
the survival of any other agreement of Borrower hereunder, Borrower's 
obligations under this Section 2(h)(iv) shall survive termination of 
this Agreement.

(v)  Notwithstanding anything contained herein to the contrary, Bank 
may, with respect to notices by Borrower for Advances in an Optional 
Currency or voluntary prepayments of less than the full amount of an 
Optional Currency Advance, engage in reasonable rounding of the Optional 
Currency amounts requested to be loaned or repaid; and, in such event, 
Bank shall promptly notify Borrower of such rounded amounts and 
Borrower's request or notice shall thereby be deemed to reflect such 
rounded amounts. 

(vi)  If on any Computation Date the Dollar Equivalent Line of Credit 
Usage is equal to or greater than the Line of Credit Commitment as a 
result of a change in exchange rates between one (1) or more Optional 
Currencies and Dollars, then the Bank shall notify the Borrower of the 
same.  The Borrower shall pay or prepay Advances (subject to Borrower's 
indemnity obligations under Section 2(m) hereof) within three (3) 
Business Days after receiving such notice by an amount such that the 
Dollar Equivalent Line of Credit Usage shall not exceed the Line of 
Credit Commitment after giving effect to such payments or prepayments. 

(vii)  If (a) as a result of the implementation of the European monetary 
union, any Optional Currency ceases to be lawful currency of the nation 
issuing the same and is replaced by a European common currency (the 
"Euro") or (b) any Optional Currency and the Euro are at the same time 
recognized by any governmental authority of the nation issuing such 
currency as lawful currency of such nation and the Bank shall so request 
in a notice delivered to the Borrower, then any amount payable hereunder 
by any party hereto in such Optional Currency shall instead be payable 
in the Euro and the amount so payable shall be determined by translating 
the amount payable in such Optional Currency to the Euro at the exchange 
rate recognized by the European Central Bank for the purpose of 
implementing the European monetary union.  Prior to the occurrence of 
the event or events described in clause (a) of (b) of the preceding 
sentence, each amount payable hereunder in any Optional Currency will, 
except as otherwise provided herein, continue to be payable only in that 
Optional Currency.

The Borrower agrees at the request of the Bank, to compensate the Bank 
for any loss, cost, expense or reduction in return that Bank shall 
reasonably determine shall be incurred or sustained by the Bank as a 
result of the implementation of the European monetary union and that 
would not have been incurred or sustained but for the transactions 
provided for herein.  A certificate of the Bank setting forth the Bank's 
determination of the amount or amounts necessary to compensate Bank 
shall be delivered to the Borrower, and shall be conclusive absent 
manifest error so long as such determination is made on a reasonable 
basis.  The Borrower shall pay the Bank the amount shown as due on any 
such certificate within ten (10) days after the receipt thereof.

The parties hereto agree, at the time of or at any time following the 
implementation of the European monetary union, to use reasonable efforts 
to enter into an agreement amending this Agreement in order to reflect 
the implementation of such monetary union, to permit (if feasible) the 
Euro to qualify as an Optional Currency under the terms and conditions 
of the definition of such term and to place the parties hereto in the 
position with respect to the settlement of payments of the Euro as they 
would have been with respect to the settlement of the Optional 
Currencies it replaced.

(viii)  For all purposes of this Agreement and the Line of Credit 
Note with respect to any aspects of the Euro-Rate, any Advance under the 
Euro-Rate Option or any Optional Currency, Bank shall be presumed to 
have obtained rates, funding, currencies, deposits, and the like in the 
applicable interbank market regardless whether it did so or not; and 
Bank's determination of amounts payable under, and actions required or 
authorized by this Agreement shall be calculated, at Bank's option, as 
though Bank funded its Advances under the Euro-Rate Option through the 
purchase of deposits of the types and maturities corresponding to the 
deposits used as a reference in accordance with the terms hereof in 
determining the Euro-Rate applicable to such Advances, whether in fact 
that is the case.

(i)  Taxes.

(i)  No Deductions.   All payments made by Borrower hereunder and under 
the Notes and Reimbursement Agreement shall be made free and clear of 
and without deduction for any present or future taxes, levies, imposts, 
deductions, charges, or withholdings, and all liabilities with respect 
thereto, excluding taxes imposed on the net income of Bank and all 
income and franchise taxes applicable to Bank (all such non-excluded 
taxes, levies, imposts, deductions, charges, withholdings, and 
liabilities being hereinafter referred to as "Taxes").  If Borrower 
shall be required by law to deduct any Taxes from or in respect of any 
sum payable hereunder or under the Notes or the Reimbursement Agreement, 
(i) the sum payable shall be increased as may be necessary so that after 
making all required deductions (including deductions applicable to 
additional sums payable under this Section) Bank receives an amount 
equal to the sum it would have received had no such deductions been 
made, (ii) Borrower shall make such deductions and (iii) Borrower shall 
timely pay the full amount deducted to the relevant tax authority or 
other authority in accordance with applicable law.

(ii)  Stamp Taxes.   In addition, Borrower agrees to pay any present or 
future stamp or documentary taxes or any other excise or property taxes, 
charges, or similar levies which arise from any payment made hereunder 
or from the execution, delivery, or registration of, or otherwise with 
respect to, this Agreement, the Notes or the Reimbursement Agreement 
(hereinafter referred to as "Other Taxes").

(iii)  Indemnification for Taxes Paid by Bank.  Borrower shall indemnify 
Bank for the full amount of Taxes or Other Taxes (including, without 
limitation, any Taxes or Other Taxes imposed by any jurisdiction on 
amounts payable under this Section) paid by Bank and any liability 
(including penalties, interest, and expenses) arising therefrom or with 
respect thereto, whether or not such Taxes or Other Taxes were correctly 
or legally asserted.  This indemnification shall be made within 30 days 
from the date Bank makes written demand therefor.

(iv)  Certificate.  Promptly upon the Bank's request from time to time, 
Borrower shall furnish to Bank the original or a certified copy of a 
receipt evidencing payment of any Taxes or Other Taxes.   If no Taxes 
are payable in respect of any payment by Borrower, such Borrower shall, 
if so requested by Bank, provide a certificate of an officer of Borrower 
to that effect.

(v)  Survival.   Without prejudice to the survival of any other 
agreement of Borrower hereunder, the agreements and obligations of 
Borrower contained in this Section shall survive the payment in full of 
principal and interest hereunder and under any instrument delivered 
hereunder.

(j)  Judgment Currency Procedures for Judgments.  

(i)  If for the purposes of obtaining judgment in any court it is 
necessary to convert a sum due hereunder or under the Notes or 
Reimbursement Agreement in any currency (the "Original Currency") into 
another currency (the "Other Currency"), the parties hereby agree, to 
the fullest extent permitted by law, that the rate of exchange used 
shall be that at which in accordance with normal banking procedures Bank 
could purchase the Original Currency with the Other Currency after any 
premium and costs of exchange on the Business Day preceding that on 
which final judgment is given.

(ii)  The obligation of Borrower in respect of any sum due from Borrower 
to Bank hereunder shall, notwithstanding any judgment in an Other 
Currency, whether pursuant to a judgment or otherwise, be discharged 
only to the extent that, on the Business Day following receipt by Bank 
of any sum adjudged to be so due in such Other Currency, Bank may in 
accordance with normal banking procedures purchase the Original Currency 
with such Other Currency.  If the amount of the Original Currency so 
purchased is less than the sum originally due to Bank in the Original 
Currency, Borrower agrees, as a separate obligation and notwithstanding 
any such judgment or payment, to indemnify Bank against such loss.

(k)  Payment Terms of Line of Credit.  The Borrower shall pay accrued 
interest on the unpaid principal balance of the Line of Credit Note in 
arrears:  (a) for the portion of the Advances bearing interest under the 
Base Rate Option, on the last Business Day of each calendar quarter 
during the term of the Line of Credit, (b) for the portion of the 
Advances bearing interest under the Euro-Rate Option, on the last day of 
the respective Euro-Rate Interest Period for each such Advance, (c) if 
any Euro-Rate Interest Period is longer than three (3) months, then also 
on the three (3) month anniversary of such interest period and every 
three (3) months thereafter, and (d) for all Advances, at maturity, 
whether by acceleration of the Line of Credit Note or otherwise, and 
after maturity, on demand until paid in full.  All outstanding Advances 
under the Line of Credit and accrued interest thereon shall be due and 
payable in full on the Expiration Date.    

(l)  Prepayment of Advances.   The Borrower shall have the right to 
prepay at any time and from time to time, in whole or in part, without 
penalty, any Advance under the Line of Credit which is accruing interest 
under the Base Rate Option.  If the Borrower prepays all or any part of 
any Advance which is accruing interest under the Euro-Rate Option on 
other than the last day of the applicable Euro-Rate Interest Period, the 
Borrower shall pay to the Bank, on demand therefore, all amounts due 
pursuant to paragraph (m) below, including the Cost of Prepayment, if 
any. 

(m)  Yield Protection.  The Borrower shall pay to the Bank, on written 
demand therefor, together with the written evidence of the justification 
therefor, all direct costs incurred, losses suffered or payments made by 
Bank by reason of any change in law or regulation or its interpretation 
imposing any reserve, deposit, allocation of capital, or similar 
requirement (including without limitation, Regulation D of the Board of 
Governors of the Federal Reserve System) on the Bank, its holding 
company or any of their respective assets.  In addition, the Borrower 
agrees to indemnify the Bank against any liabilities, losses or expenses 
(including loss of margin, any loss or expense sustained or incurred  in 
liquidating or employing deposits from third parties, and any loss or 
expense incurred in connection with funds  acquired to effect, fund or 
maintain any Advance (or any part thereof) bearing interest under the 
Euro-Rate Option) which the Bank sustains or incurs as a consequence of 
either (i) the Borrower's failure to make a payment on the due date 
thereof, (ii) the Borrower's revocation (expressly, by later 
inconsistent notices or otherwise) in whole or in part of any notice 
given to Bank to request, convert, renew or prepay any Advance, or (iii) 
the Borrower's payment, prepayment or conversion of any Advance bearing 
interest under the  Euro-Rate Option on a day other than the last day of 
the applicable Euro-Rate Interest Period, including but not limited to 
the Cost of Prepayment.  "Cost of Prepayment" means an amount equal to 
the present value, if positive, of the product of (a) the difference 
between (i) the yield, on the beginning date of the applicable interest 
period, of a U.S. Treasury obligation with a maturity similar to the 
applicable interest period minus (ii) the yield, on the prepayment date, 
of a U.S. Treasury obligation with a maturity similar to the remaining 
maturity of the applicable interest period, and (b) the principal amount 
to be prepaid, and (c) the number of years, including fractional years 
from the prepayment date to the end of the applicable interest period.  
The yield on any U.S. Treasury obligation shall be determined by 
reference to Federal Reserve Statistical Release H.15(519) "Selected 
Interest Rates".  For purposes of making present value calculations, the 
yield to maturity of a similar maturity U.S. Treasury obligation on the 
prepayment date shall be deemed the discount rate.  The Cost of 
Prepayment shall also apply to any payments made after acceleration of 
the maturity of the Advances.  The Bank's determination of an amount 
payable under this paragraph shall, in the absence of manifest error, be 
conclusive and shall be payable on demand.

(n)  Conversion of Advances to a Term Loan.   Provided that no Event of 
Default or Default exists on either the date such Term Conversion 
Request is delivered or on the Conversion Date, the Borrower shall have 
the option, by delivering written notice (the "Term Conversion 
Request"), which notice shall be irrevocable, to the Bank no earlier 
than twenty (20) days prior to (but no later than ten (10) days prior 
to) the Initial Expiration Date, to convert the principal amount of 
Advances then outstanding on the Initial Expiration Date, or a portion 
thereof, to an amortizing term loan (the "Term Loan") payable over a two 
(2) year period (based upon a five (5) year amortization) as set forth 
below.   Commencing on the last day of the calendar quarter immediately 
following the month in which the Conversion Date occurs, the principal 
balance of the Term Loan shall be paid in seven (7) equal consecutive 
quarterly installments of principal in an amount determined by dividing 
the principal balance of the Term Loan on the Conversion Date by twenty 
(20), with one (1) final balloon payment on the second anniversary of 
the Conversion Date in an amount equal to the remaining outstanding 
principal balance under the Term Loan.  The obligation of the Borrower 
to repay the Term Loan shall be evidenced by a separate promissory note 
in form and content satisfactory to the Bank (the "Term Note").  
Interest on the unpaid balance of the Term Loan will be charged at the 
rates, and be payable on the dates and times, as set forth in the Term 
Note.       

Upon the Borrower's election to convert the principal amount of Advances 
then outstanding on the Initial Expiration Date (or a portion thereof) 
to a Term Loan, then assuming the Bank, in its sole discretion, decides 
to extend the Expiration Date in accordance with Section 2(b) hereof,  
the Line of Credit Commitment shall be permanently reduced by an amount 
equal to the principal amount of such Term Loan automatically without 
need for any further action or documentation.    

(o)  Reduction of Line of Credit Commitment.  Subject to the indemnity 
provisions of Section 2(m) hereof, the Borrower shall have the right at 
any time and from time to time upon five (5) Business Days' prior 
written notice to the Bank to permanently terminate, or from time to 
time permanently reduce in whole or in minimal principal amounts of 
$5,000,000, or an integral multiple thereof, the Line of Credit 
Commitment in effect at such time.  Any such reduction or termination 
shall be accompanied by (i) the payment in full of any Commitment Fee 
then accrued on the amount of such reduction or termination, and (ii) if 
on any date when the Line of Credit Commitment is reduced the Dollar 
Equivalent Line of Credit Usage exceeds the Line of Credit Commitment as 
so reduced, then the payment of an amount equal to such excess so that, 
after giving effect to such payment, the Dollar Equivalent Line of 
Credit Usage does not exceed the Line of Credit Commitment as so 
reduced.    Additionally, to the extent the Letters of Credit 
Outstanding exceed the Line of Credit Commitment as so reduced, then on 
any such date when the Line of Credit Commitment is reduced the Borrower 
shall make a deposit (in an amount equal to such excess) into the Cash 
Collateral Account.  From the effective date of any such reduction, the 
obligations of Borrower to pay the Commitment Fee pursuant to Section 19 
hereof shall correspondingly be reduced or cease.  Notice of such 
reduction shall be irrevocable once given and the portion of the Line of 
Credit Commitment so reduced shall not be available for borrowing once 
such notice has been given.

3.  The Letters of Credit.   

(a)  Subject to the terms and conditions hereof, the Borrower may 
request that the Bank, in lieu of cash Advances under the Line of 
Credit, issue a letter of credit (each a "Letter of Credit") for the 
account of the Borrower by delivering to the Bank a completed 
application and a reimbursement agreement (a "Reimbursement Agreement") 
for Letters of Credit in such form as the Bank may specify from time to 
time by no later than 10:00 a.m., Pittsburgh time, at least three (3) 
Business Days, or such shorter period as may be agreed to by the Bank, 
in advance of the proposed date of issuance.  Each Letter of Credit 
shall be either a standby letter of credit or a commercial letter of 
credit and may be denominated in either Dollars or an Optional Currency.  
Subject to the terms and conditions hereof, the Bank will issue for the 
account of the Borrower one or more Letters of Credit in Dollars or an 
Optional Currency provided that each Letter of Credit shall (A) have a 
maximum maturity of twelve (12) months from the date of issuance in the 
case of standby Letters of Credit and six (6) months from the date of 
issuance in the case of commercial Letters of Credit, and (B) in no 
event expire later than ten (10) Business Days prior to the Expiration 
Date, and provided further that in no event shall (i) the Dollar 
Equivalent amount of Letters of Credit Outstanding exceed, at any one 
time, $5,000,000 or (ii) the Dollar Equivalent Line of Credit Usage 
exceed, at any one time, the Line of Credit Commitment. This Agreement 
is not a pre-advice for the issuance of a Letter of Credit and is not 
irrevocable.    

(b)  Borrower agrees to be bound by the terms of the Bank's letter of 
credit application and Reimbursement Agreement and the Bank's written 
regulations and customary practices relating to Letters of Credit.   In 
the event of a conflict between such application or Reimbursement 
Agreement and this Agreement, this Agreement shall govern.  It is 
understood and agreed that, except in the case of gross negligence or 
willful misconduct, the Bank shall not be liable for any error, 
negligence and/or mistakes, whether of omission or commission, in 
following Borrower's instructions or those contained in the Letters of 
Credit or any modifications, amendments or supplements thereto.

4.   The Term Loan.

(a)  Type of Facility.   The second credit facility covered by this 
Agreement is Borrower's Existing Rate Protection Term Loan (the "Rate 
Protection Term Loan") in the amount of 237,000,000 Japanese Yen.  

(b)  Interest Rate.  Amounts outstanding under the Rate Protection Term 
Loan will bear interest at the rate or rates as provided in the Rate 
Protection Term Note.

(c)  Repayment.  Principal of, and interest accrued on, the Rate 
Protection Term Loan shall be payable on the dates and times as provided 
in the Rate Protection Term Note.

(d)  Note.  The obligation of the Borrower to repay the Rate Protection 
Term Loan shall continue to be evidenced by the Existing Rate Protection 
Term Note (the "Rate Protection Term Note").   The Borrower acknowledges 
and agrees that, effective the date of this Agreement, Section 4 of the 
Rate Protection Term Note (entitled "Other Loan Documents") is hereby 
amended by substituting the date "September 25, 1997" contained therein 
and replacing it with the following date and words "March 26, 1999, and 
any amendments, modifications, renewals or restatements thereof". 

5.  Use of Proceeds.  The proceeds of the Advances and Letters of 
Credit shall be used by the Borrower to fund working capital needs of 
the Borrower and other general corporate purposes and to fund Permitted 
Acquisitions and Permitted Stock Repurchases. The proceeds of the Rate 
Protection Term Loan were used by the Borrower to fund foreign exchange 
transactions as provided under the Existing Letter Agreement.  

6.  Loan Documents.  This Agreement, the Line of Credit Note, the Term 
Note (if applicable), the Rate Protection Term Note, the Reimbursement 
Agreement, the Guarantees and the other loan documents referenced herein 
and/or delivered pursuant hereto are collectively referred to as the 
"Loan Documents".

7.  Guarantees.   The Borrower must cause each Guarantor to execute 
and deliver to the Bank a guaranty and suretyship agreement 
(collectively, the "Guarantees"), in substantially the form of Exhibit B 
attached hereto, under which each Guarantor will unconditionally jointly 
and severally guarantee the due and punctual payment of all indebtedness 
owed to the Bank by the Borrower. 

8.  Collateral.  (a) If at any time the Leverage Ratio is greater than 
1.50 to 1.0 for a period of two (2) consecutive quarters (the "Trigger 
Date"), the Borrower shall (within ten (10) Business Days from Bank's 
demand therefore and at Borrower's sole cost and expense) pledge (or 
cause to be pledged) to the Bank, as collateral security for all 
obligations owing by Borrower to Bank under the Loan Documents (i) a 
first priority perfected lien on all of Borrower's and its domestic 
Subsidiaries' accounts receivable, inventory, equipment, fixtures, 
chattel paper, documents, instruments and general intangibles, and (ii) 
a first priority perfected lien on 65% of the voting stock of Borrower's 
foreign Subsidiaries.  Failure to timely pledge such collateral and 
stock shall constitute an Event of Default.  

(b) If the Leverage Ratio is less than or equal to 1.5 to 1.0 for a 
period of four (4) consecutive quarters after the Trigger Date, then the 
Bank shall release, at Borrower's expense, the collateral described in 
subsection (a) above with the exception that the pledged stock of 
Borrower's foreign Subsidiaries will not be released. 

9.  Conditions to Lending.  The obligation of the Bank to make any 
Advance under the Line of Credit or issue any Letter of Credit is 
subject to the conditions that:
 
(a)  in the case of the initial Advance and initial Letter of Credit 
hereunder, the Borrower shall (i) provide to the Bank this Agreement, 
the Line of Credit Note, the Reimbursement Agreement,  and the 
Guarantees, each duly executed by the Borrower and the Guarantors, as 
the case may be; (ii) provide to the Bank evidence of the due 
authorization by the Borrower and the Guarantors of this Agreement, the 
Line of Credit Note, the Reimbursement Agreement and the Guarantees; 
(iii) provide to the Bank such other instruments as the Bank shall 
reasonably require in form and substance satisfactory to the Bank; and 
(iv) provide to the Bank an opinion of counsel to the Borrower and the 
Guarantors addressing such matters relating to the Borrower and the 
Guarantors and this transaction as the Bank may request.  

(b)  each request for an Advance (including the initial Advance) under 
the Line of Credit or the issuance of a Letter of Credit (including the 
initial Letter of Credit) shall constitute a certification by the 
Borrower that the Borrower shall have performed and complied with all 
agreements and conditions herein required under this Agreement, and at 
the time of such Advance or Letter of Credit, no condition or event 
shall exist which constitutes a Default or an Event of Default. 

The Bank will not be obligated to make any Advance under the Line of 
Credit or issue any Letter of Credit if any Event of Default or Default 
shall have occurred and be continuing.

10.  Affirmative Covenants.  Unless waived in writing by the Bank or 
until payment in full of the Rate Protection Term Loan, the Term Loan 
(if applicable), the Line of Credit and all Reimbursement Obligations, 
and the termination of the Line of Credit and cancellation of all 
Letters of Credit:

(a)  The Borrower shall maintain books and records in accordance with 
GAAP and give representatives of the bank access thereto at all 
reasonable times, including permission to examine, copy and make 
abstracts from any of such books and records and such other information 
as the Bank may from time to time reasonably request, and the Borrower 
will make available to the Bank for examination copies of any reports, 
statements or returns which the Borrower may make to or file with any 
governmental department, bureau or agency, federal or state.

(b)  Within 90 days of the end of the Borrower's fiscal year, the 
Borrower will deliver to the Bank (i) its annual report on Securities 
and Exchange Commission Form 10K, and (ii) its consolidated balance 
sheet and consolidated statement of income, retained earnings and cash 
flows for the fiscal year, audited and certified without qualification 
by a certified public accountant acceptable to the Bank and prepared in 
accordance with GAAP, together with (A) a certificate in substantially 
the form of Exhibit C attached hereto (a "Compliance Certificate") from 
the Chief Financial Officer of the Borrower setting forth detailed 
calculations necessary to demonstrate  Borrower's compliance with the 
financial covenants set forth below for the period then ended, and 
showing whether any Event of Default exists and, if so, the nature 
thereof and the corrective measures Borrower proposes to take, and (B) 
any management letters of Borrower's accountants addressed to the 
Borrower.

(c)  Within 45 days of the end of each of the Borrower's fiscal 
quarters, the Borrower will deliver to the Bank its quarterly report on 
Securities and Exchange Commission Form 10Q.

(d)  Within 45 days of the end of each of the Borrower's first three 
fiscal quarters, the Borrower will deliver to Bank its consolidated 
balance sheets and consolidated statements of income, retained earnings 
and cash flow together with a Compliance Certificate from the Chief 
Financial Officer of the Borrower setting forth detailed calculations 
necessary to demonstrate  Borrower's compliance with the financial 
covenants set forth below for the period then ended, and showing whether 
any Event of Default exists and, if so, the nature thereof and the 
corrective measures Borrower proposes to take.

(e)  The Borrower will promptly submit to Bank such other information 
relating to the Borrower as the Bank may reasonably request.

(f)  The Borrower will pay and discharge when due all indebtedness and 
all taxes, assessments, charges, levies and other liabilities imposed 
upon the Borrower, its income, profits, property or business, except 
those which currently are being contested in good faith by appropriate 
proceedings and for which the Borrower shall have set aside adequate 
reserves or made other adequate provision with respect thereto 
acceptable to the Bank in its sole discretion.

(g)  The Borrower will do all things necessary to maintain, renew and 
keep in full force and effect its organizational existence and all 
rights, permits and franchises necessary to enable it to continue its 
business;  continue in operation in substantially the same manner as at 
present; keep its properties in good operating condition and repair; and 
make all necessary and proper repairs, renewals, replacements, additions 
and improvements thereto.

(h)  The Borrower will maintain with financially sound and reputable 
insurers, insurance with respect to its property and business against 
such casualties and contingencies, of such types and in such amounts as 
is customary for established companies engaged in the same or similar 
business and similarly situated.  

(i)  The Borrower will comply with all laws applicable to the Borrower 
and to the operation of its business (including any statute, rule or 
regulation relating to employment practices and pension benefits or to 
environmental, occupational and health standards and controls). 

(j)  The Borrower shall cause, at all times, the indebtedness 
outstanding under  this Agreement to rank at least pari passu with all 
other indebtedness for borrowed money of the Borrower, the principal 
amount of which is in excess of $1,000,000.

11.  Negative Covenants.   Unless waived in writing by the Bank or 
until payment in full of the Rate Protection Term Loan, the Term Loan 
(if applicable), the Line of Credit and all Reimbursement Obligations, 
and the termination of the Line of Credit and cancellation of all 
Letters of Credit, the Borrower covenants and agrees that it will not, 
without the Bank's prior written consent:

(a)  Make or permit any material change in the nature of its business 
as carried on as of the date of this Agreement or permit any change in 
control of more than a majority of its board of directors or its voting 
stock.

(b)  Create, assume, incur or suffer to exist any mortgage, 
pledge, encumbrance, security interest, lien or charge of any kind upon 
any of its property (including without limitation the stock of 
Borrower's foreign Subsidiaries), now owned or hereafter acquired, or 
acquire or agree to acquire any kind of property under conditional sales 
or other title retention agreements; provided, however, that the 
foregoing restrictions shall not prevent the Borrower from:

(i)  incurring liens for taxes, assessments or governmental charges or 
levies which shall not at the time be due and payable or can thereafter 
be paid without penalty or are being contested in good faith by 
appropriate proceedings diligently conducted and with respect to which 
it has created adequate reserves;

(ii)  making pledges or deposits to secure obligations under workers' 
compensation laws or similar legislation;

(iii)  granting additional liens or security interests to secure existing 
or future  indebtedness in an aggregate principal amount at any time not 
to exceed $1,000,000; or

(iv)  granting liens or security interests in favor of the Bank.

(c)  Create, incur, guarantee, endorse (except endorsements in the 
course of collection), assume or suffer to exist any indebtedness, 
except:

(i)  indebtedness to the Bank;

(ii)  open account trade debt incurred in the ordinary course of 
business and not past due; or

(iii)  existing indebtedness and future indebtedness (including without 
limitation any Seller Notes) in an aggregate principal amount at any 
time not to exceed $1,750,000, and any refinancings thereof; provided 
that the amount of the refinancing indebtedness is not more than the 
outstanding amount of the refinanced indebtedness.

(d)  Liquidate, or dissolve, or merge or consolidate with any person, 
firm, corporation or other entity (except for mergers or consolidations 
where the Borrower is the surviving entity), or sell, lease, transfer or 
otherwise dispose of all or any substantial part of its property or 
assets, whether now owned or hereafter acquired (except for the sale of 
non-material assets in an aggregate fair market value not to exceed 
$1,000,000 at any time).

(e)  Make acquisitions of all or substantially all of the property or 
assets of any person, firm, corporation or other entity, except for 
Permitted Acquisitions.

(f)  Declare or pay any dividends on or make any distribution with 
respect to any class of its equity, or purchase, redeem, retire or 
otherwise acquire any of its equity, except for Permitted Stock 
Repurchases.

(g)  Make or have outstanding any loans or advances to or otherwise 
extend credit to any person, firm or corporation, except in the ordinary 
course of business.

(h)  Enter into (or permit any of its Subsidiaries to enter into) any 
agreement with any person which prohibits it (or its Subsidiaries) from 
granting any liens on any of its property (real or personal) to the 
Bank. 

12.  Financial Covenants. Unless waived in writing by the Bank or until 
payment in full of the Rate Protection Term Loan, the Term Loan (if 
applicable), the Line of Credit and all Reimbursement Obligations, and 
the termination of the Line of Credit and cancellation of all Letters of 
Credit:

(a)  Minimum Net Worth.  The Borrower will not allow its Tangible Net 
Worth to be less than $41,000,000 at any time, (i) to be increased at 
the end of each fiscal quarter commencing on March 31, 1999 by an amount 
equal to (x) 50% of Borrower's net income (if a positive number) for the 
fiscal quarter most recently then ending, and (y) 100% of the net cash 
proceeds (defined as the cash proceeds received from any equity offering 
net of reasonable transaction costs (including any underwriting, 
brokerage or other customary selling commissions and reasonable legal, 
advisory and other fees and expenses associated therewith and actually 
incurred)) from the issuance by the Borrower of any equity securities or 
other equity capital investments for the fiscal quarter most recently 
then ending, and (ii) to be decreased by the amount (as calculated in 
accordance with GAAP) attributed to any Permitted Stock Repurchase. 

(b)  Leverage Ratio. The Borrower will maintain as of the end of each 
fiscal quarter, a Leverage Ratio of not greater than 2.5 to 1.

(c)  Interest Coverage Ratio. The Borrower will maintain as of the end 
of each fiscal quarter an Interest Coverage Ratio of at least 5.0 to 
1.0.

(d)  Capital Expenditures. The Borrower will not make Capital 
Expenditures in any one fiscal year of the Borrower in excess of 125% of 
the capital expenditures reflected in the Borrower's most recent five 
year plan attached hereto as Schedule V.   Carryover is not permitted.

13.  Representations and Warranties.  To induce the Bank to extend the 
Line of Credit, and upon each request for the making of any Advance 
under the Line of Credit or the issuance of any Letter of Credit to the 
Borrower, the Borrower represents and warrants to the Bank as follows:
 
(a)  The Borrower is duly organized, validly existing and in good 
standing under the laws of the state of its incorporation or 
organization and has the power and authority to own and operate its 
assets and to conduct its business as now or proposed to be carried on, 
and is duly qualified, licensed and in good standing to do business in 
all jurisdictions where its ownership of property or the nature of its 
business requires such qualification or licensing.

(b)  The Borrower has the power to make and carry out the terms of the 
Loan Documents and has taken all necessary corporate action to authorize 
the execution, delivery and performance of the Loan Documents.

(c)  The Loan Documents constitute the legally binding obligations of 
the Borrower, enforceable against the Borrower in accordance with their 
respective terms. 

(d)  All of the Borrower's domestic and foreign Subsidiaries in 
existence on the date hereof are listed on Schedule III attached hereto.

(e)  The making and performance of the Loan Documents do not and will 
not violate in any respect any provisions of (i) any federal, state or 
local law or regulation or any order or decree of any federal, state or 
local governmental authority, agency or court, or (ii) the 
organizational documents of the Borrower or of any of its Subsidiaries, 
or (iii) any mortgage, contract or other undertaking to which the 
Borrower is a party or which is binding upon the Borrower or any of its 
Subsidiaries or any of their respective assets, and do not and will not 
result in the creation or imposition of any security interest, lien, 
charge or other encumbrance on any of their respective assets pursuant 
to the provisions of any such mortgage, contract or other undertaking.

(f)  Neither the Borrower nor any of its Subsidiaries is in default 
with respect to any material order, writ, injunction or decree (i) of 
any court or (ii) of any Federal, state, municipal or other governmental 
instrumentality.  The Borrower and each Subsidiary is substantially 
complying with all applicable statutes and regulations of each 
governmental authority having jurisdiction over its activities, except 
where failure to comply would not have a material adverse effect on the 
Borrower and its Subsidiaries, taken as a whole.

(g)  There are no actions, suits, proceedings or governmental 
investigations pending or, to the knowledge of the Borrower, threatened 
against the Borrower which could result in a material adverse change in 
its business, assets, operations, financial condition or results of 
operations and there is no basis known to the Borrower or its officers 
or directors for any such action, suit, proceedings or investigation.

(h)  The Borrower's latest financial statements provided to the Bank 
are true, complete and accurate in all material respects and fairly 
present the financial condition, assets and liabilities, whether 
accrued, absolute, contingent or otherwise and the results of the 
Borrower's operations for the period specified therein.  The Borrower's 
financial statements have been prepared in accordance with GAAP.  Since 
the date of the latest financial statements provided to the Bank, the 
Borrower has not suffered any damage, destruction or loss which has 
materially adversely affected its business, assets, operations, 
financial condition or results of operations.

(i)  The Borrower has filed all returns and reports that are required 
to be filed by it in connection with any federal, state or local tax, 
duty or charge levied, assessed or imposed upon the Borrower or its 
property, including unemployment, social security and similar taxes and 
all of such taxes have been either paid or adequate reserve or other 
provision has been made therefor.

(j)  Each employee benefit plan as to which the Borrower may have any 
liability complies in all material respects with all applicable 
provisions of the Employee Retirement Income Security Act of 1974 
("ERISA"), including minimum funding requirements, and (i) no Prohibited 
Transaction (as defined under ERISA) has occurred with respect to any 
such plan, (ii) no Reportable Event (as defined under Section 4043 of 
ERISA) has occurred with respect to any such plan which would cause the 
Pension Benefit Guaranty Corporation to institute proceedings under 
Section 4042 of ERISA, (iii) the Borrower has not withdrawn from any 
such plan or initiated steps to do so, and (iv) no steps have been taken 
to terminate any such plan.

(k)  The Borrower is in compliance, in all material respects, with all 
Environmental Laws, including, without limitation, all Environmental 
Laws in jurisdictions in which the Borrower owns or operates, or has 
owned or operated, a facility or site, stores collateral, arranges or 
has arranged for disposal or treatment of hazardous substances, solid 
waste or other waste, accepts or has accepted for transport any 
hazardous substances, solid waste or other wastes or holds or has held 
any interest in real property or otherwise.  Except as otherwise 
disclosed Schedule IV attached hereto, no litigation or proceeding 
arising under, relating to or in connection with any Environmental Law 
is pending or, to the best of the Borrower's knowledge, threatened 
against the Borrower, any real property which the Borrower holds or has 
held an interest or any past or present operation of the Borrower.  No 
release, threatened release or disposal of hazardous waste, solid waste 
or other wastes is occurring, or to the best of the Borrower's knowledge 
has occurred, on, under or to any real property in which the Borrower 
holds any interest or performs any of its operations, in violation of 
any Environmental Law.  As used in this Section, "litigation or 
proceeding" means any demand, claim notice, suit, suit in equity, 
action, administrative action, investigation or inquiry whether brought 
by a governmental authority or other person, and "Environmental Laws" 
means all provisions of laws, statutes, ordinances, rules, regulations, 
permits, licenses, judgments, writs, injunctions, decrees, orders, 
awards and standards promulgated by any governmental authority  
concerning health, safety and protection of, or regulation of the 
discharge of substances into, the environment.

(l)  The Borrower owns or is licensed to use all patents, patent 
rights, trademarks, trade names, service marks, copyrights, intellectual 
property, technology, know-how and processes necessary for the conduct 
of its business as currently conducted that are material to the 
condition (financial or otherwise), business or operations of the 
Borrower.

(m)  No part of the proceeds of the Advances will be used for 
"purchasing" or "carrying" any "margin stock" within the respective 
meanings of each of the quoted terms under Regulation U of the Board of 
Governors of the Federal Reserve System as now and from time to time in 
effect or for any purpose which violates the provisions of the 
Regulations of such Board of Governors.

(n)  As of the date hereof and after giving effect to the transactions 
contemplated by the Loan Documents, (i) the aggregate value of the 
Borrower's assets will exceed its liabilities (including contingent, 
subordinated, unmatured and unliquidated liabilities), (ii) the Borrower 
will have sufficient cash flow to enable it to pay its debts as they 
mature, and (iii) the Borrower will not have unreasonably small capital 
for the business in which it is engaged.
  
(o)  None of the Loan Documents contains or will contain any untrue 
statement of material fact or omits or will omit to state a material 
fact necessary in order to make the statements contained in this 
Agreement or the Loan Documents not misleading.  There is no fact known 
to the Borrower which materially adversely affects or, so far as the 
Borrower can now foresee, might materially adversely affect the 
business, assets, operations, financial condition or results of 
operation of the Borrower and which has not otherwise been fully set 
forth in this Agreement or in the Loan Documents.

(p)  The Borrower has reviewed the areas within its business and 
operations which could be adversely affected by, and has developed or is 
developing a program to address on a timely basis the risk that certain 
computer applications used by the Borrower may be unable to recognize 
and perform properly date-sensitive functions involving dates prior to 
and after December 31, 1999 (the "Year 2000 Problem").  The Year 2000 
Problem is not reasonably expected to result in any material adverse 
effect on the business, properties, assets, financial condition, results 
of operations or prospects of the Borrower, or the ability of the 
Borrower to duly and punctually pay or perform its obligations hereunder 
and under the other Loan Documents.

14.  Events of Default.   The occurrence of any of the following events 
(whatever the reason therefor and whether voluntary, involuntary or 
effected by operation of law) will be deemed to be an "Event of 
Default":

(a)   the nonpayment of any principal, interest, reimbursement 
obligation or other indebtedness under this Agreement, the Notes or any 
other Loan Document when due;

(b)  The occurrence of any event of default or default and the lapse of 
any notice or cure period under any Loan Document or any other debt, 
liability or obligation to the Bank of any Obligor;

(c)  the filing by or against the Borrower of any proceeding in 
bankruptcy, receivership, insolvency, reorganization, liquidation, 
conservatorship or similar proceeding (and, in the case of any such 
proceeding instituted against the Borrower, such proceeding is not 
dismissed or stayed within thirty (30) days of the commencement thereof 
(provided that the Bank is not obligated to make any Advances or issue 
any Letters of Credit under the Line of Credit during such 30 day 
period));

(d)  any assignment by the Borrower for the benefit of creditors, or 
any levy, garnishment, attachment or similar proceeding (in excess of 
$100,000 in the aggregate) is instituted against any property of the 
Borrower held by or deposited with the Bank (and, in the case of any 
levy, garnishment, attachment or similar proceeding instituted against 
any such property of the Borrower, such proceeding is not dissolved 
within ten (10) days of the commencement thereof (provided that the Bank 
is not obligated to make any Advances or issue any Letters of Credit 
under the Line of Credit during such ten (10) day period));

(e)  a default with respect to any other indebtedness of any Obligor 
for borrowed money in excess of $100,000 in the aggregate, if the effect 
of such default is to cause or permit the acceleration of such debt;

(f)  the commencement of any foreclosure or forfeiture proceeding, 
execution or attachment against any collateral (having a fair market 
value in excess of $100,000 in the aggregate) securing the obligations 
of any Obligor to the Bank, and the failure of such Obligor to discharge 
such proceeding within ten (10) days of the commencement thereof; 

(g)  the entry of a final judgment in excess of $100,000 in the 
aggregate against any Obligor and the failure of such Obligor to 
discharge the judgment within ten (10) days of the entry thereof;

(h)  in the event that this Note or any guarantee executed by any 
Guarantor is secured, the failure of any Obligor to provide the Bank 
with additional collateral if in the opinion of the Bank at any time or 
times, the market value of any of the collateral securing this Note or 
any guarantee has depreciated;

(i)  any material adverse change in the business, assets, operations, 
financial condition or results of operations of any Obligor; 

(j)  any Obligor ceases doing business as a going concern;

(k)  the revocation or attempted revocation, in whole or in part, of 
any guarantee by any Guarantor;

(l)  any representation or warranty made by any Obligor to the Bank in 
any Loan Document, or any other documents now or in the future 
evidencing or securing the obligations of any Obligor to the Bank, is 
false, erroneous or misleading in any material respect; or 

(m)  the failure of any Obligor to observe or perform any covenant or 
other agreement with the Bank contained in any Loan Document or any 
other documents now or in the future evidencing or securing the 
obligations of any Obligor to the Bank.

15.  Consequences of an Event of Default.   Upon the occurrence of an 
Event of Default:  (a) the Bank shall be under no further obligation to 
make Advances hereunder or issue Letters of Credit, as the case may be; 
(b) if an Event of Default specified in clause (c) or (d) above shall 
occur, the unpaid principal balance of the Notes then outstanding and 
all interest accrued thereon together with any additional amounts 
payable hereunder and thereunder shall be immediately due and payable 
without demand or notice of any kind; (c) if any other Event of Default 
shall occur, the unpaid principal balance of the Notes then outstanding 
and all interest accrued thereon together with any additional amounts 
payable hereunder and thereunder, at the option of the Bank and without 
demand or notice of any kind, may be accelerated and become immediately 
due and payable; (d) the Bank may require the Borrower to, and the 
Borrower shall thereupon, deposit in a non-interest-bearing account (the 
"Cash Collateral Account") with the Bank, as cash collateral for its 
obligations under the Loan Documents, an amount equal to the aggregate 
maximum amount currently or at any time thereafter available to be drawn 
on all outstanding Letters of Credit, and the Borrower hereby pledges to 
the Bank, and grants to the Bank a security interest in, all such cash 
collateral as security for such obligations. Upon the curing of all 
existing Events of Default to the satisfaction of the Bank, the Bank 
shall return such cash collateral to the Borrower; (e) at the option of 
the Bank, the Notes will bear interest at the Default Rate from the date 
of the occurrence of the Event of Default; and (f) the Bank may exercise 
from time to time any of the rights and remedies available to the Bank 
under the Loan Documents or under applicable law.

16.  Right of Setoff.  In addition to all liens upon and rights of 
setoff against the money, securities or other property of the Borrower 
given to the Bank by law, the Bank shall have, with respect to the 
Borrower's obligations to the Bank under the Loan Documents and to the 
extent permitted by law, a contractual possessory security interest in 
and a contractual right of setoff against, and the Borrower hereby 
assigns, conveys, delivers, pledges and transfers to the Bank all of the 
Borrower's right, title and interest in and to, all deposits, moneys, 
securities and other property of the Borrower now or hereafter in the 
possession of or on deposit with, or in transit to, the Bank whether 
held in a general or special account or deposit, whether held jointly 
with someone else, or whether held for safekeeping or otherwise, 
excluding, however, all IRA, Keogh, and trust accounts.  Every such 
security interest and right of setoff may be exercised without demand 
upon or notice to the Borrower.  Every such right of setoff shall be 
deemed to have been exercised immediately upon the occurrence of an 
Event of Default hereunder without any action of the Bank, although the 
Bank may enter such setoff on its books and records at a later time.
  
17.  Notices.  All notices, demands, requests, consents, approvals and 
other communications required or permitted hereunder must be in writing 
and will be effective upon receipt if delivered personally to such 
party, or if sent by facsimile transmission with confirmation of 
delivery, or by nationally recognized overnight courier service, to the 
address set forth below or to such other address as any party may give 
to the other in writing for such purpose.

To the Bank:

PNC Bank, National Association
One PNC Plaza
249 Fifth Avenue
Pittsburgh, Pennsylvania 15222
Attention: Mr. Eric Bruno, Assistant Vice President
Facsimile No.: (412) 762-7353

With a copy to:

PNC Bank, National Association
One PNC Plaza
249 Fifth Avenue
Pittsburgh, Pennsylvania 15222
Attention: Thomas S. Bott, Managing Counsel
Facsimile No.: (412) 762-4334

To the Borrower:

II - VI Incorporated
375 Saxonburg Boulevard
Saxonburg, Pennsylvania 16056
Attention: James Martinelli, Treasurer and Chief Financial Officer
Facsimile No.: (724) 352-5299

With a copy to:

Sherrard, German & Kelly, PC
One Oliver Plaza, 35th Floor
Pittsburgh, Pennsylvania 15222
Attention: Robert D. German, Esq.
Facsimile No.: (412) 261-6221

18.  Documentation Fee.  On the date of this Agreement, the 
Borrower shall pay to the Bank a documentation fee of $5,000.00.

19.   Commitment Fees.  Accruing from the date hereof until the 
Expiration Date, the Borrower agrees to pay to the Bank in Dollars a 
commitment fee (the "Commitment Fee") equal to the Applicable Commitment 
Fee Rate (computed on the basis of a year of 365 or 366  days, as the 
case may be, and actual days elapsed) on the average daily Equivalent 
Amount in Dollars equal to the Line of Credit Commitment minus the sum 
of all Advances then outstanding plus all Letters of Credit Outstanding.  
All Commitment Fees shall be payable quarterly in arrears beginning June 
30, 1999, and continuing on the last Business Day of each fiscal quarter 
after the date hereof and on any date that the Line of Credit Commitment 
is terminated or reduced as provided in Section 2(o) hereof, on the 
Expiration Date, or upon acceleration of the Line of Credit Note.

20.  Letter of Credit Fees.  The Borrower shall pay to the Bank in 
Dollars a fee (the "Letter of Credit Fee") on the daily average Dollar 
Equivalent amount of outstanding standby Letters of Credit for the 
period from such standby Letter of Credit's opening date to its expiry 
date at a rate per annum equal to the then Applicable Margin applicable 
to Advances bearing interest under the Euro-Rate Option, which fee shall 
be payable on the last Business Day of each fiscal quarter, in arrears, 
following the issuance of each standby Letter of Credit, and on the 
Expiration Date.  The Borrower shall also pay to the Bank in Dollars (i) 
the Bank's then in effect customary fees payable with respect to 
commercial Letters of Credit and (ii) the Bank's then in effect 
customary fees and administrative expenses payable with respect to all 
Letters of Credit as the Bank may generally charge or incur from time to 
time in connection with the issuance, maintenance, modification (if 
any), assignment or transfer (if any), negotiation, and administration 
of Letters of Credit.

21.  Expenses.  The Borrower shall reimburse the Bank for the Bank's 
expenses (including the reasonable fees and expenses of the Bank's 
outside and in-house counsel) in connection with the collection of all 
of the Borrower's obligations to Bank, including but not limited to 
enforcement actions relating to the Loan Documents.

22.  Depository.  The Borrower will establish and maintain at the Bank 
the Borrower's primary depository accounts. 

23.  Governing Law.  This Agreement, the Notes and the other Loan 
Documents shall be governed by the laws of the Commonwealth of 
Pennsylvania, excluding its conflict of law rules. 

24.  Counterparts.  This Agreement may be executed in counterparts, 
each of which when executed by the Borrower and the Bank shall be 
regarded as an original.  

25.  Entire Agreement.    This Agreement (including the documents and 
instruments referred to herein) constitutes the entire agreement between 
the Borrower and the Bank concerning the Loans and supersedes all other 
prior agreements and understandings, both written and oral, between the 
parties with respect to the Loans.

26.   Amendments and Waivers.  No modification, amendment or waiver of 
any provision of this Agreement nor consent to any departure by the 
Borrower therefrom, will in any event be effective unless the same is in 
writing and signed by the Bank, and then such waiver or consent shall be 
effective only in the specific instance and for the purpose for which 
given.  No notice to or demand on the Borrower in any case will entitle 
the Borrower to any other or further notice or demand in the same, 
similar or other circumstance.

27.  Preservation of Rights.   No delay or omission on the part of the 
Bank to exercise any right or power arising hereunder will impair any 
such right or power or be considered a waiver of any such right or power 
or any acquiescence therein, nor will the action or inaction of the Bank 
impair any right or power arising hereunder.  The Bank's rights and 
remedies hereunder are cumulative and not exclusive of any other rights 
or remedies which the Bank may have under other agreements, at law or in 
equity.

28.  Successors and Assigns. This Agreement will be binding upon and 
inure to the benefit of the Borrower and the Bank and their respective 
heirs, executors, administrators, successors and assigns; provided, 
however, that the Borrower may not assign this Agreement in whole or in 
part without the prior written consent of the Bank and the Bank at any 
time may assign this Agreement in whole or in part.


29.  Indemnity.  The Borrower agrees to indemnify each of the Bank, its 
directors, officers and employees and each legal entity, if any, who 
controls the Bank (the "Indemnified Parties") and to hold each 
Indemnified Party harmless from and against any and all claims, damages, 
losses, liabilities and expenses (including, without limitation, all 
reasonable fees of counsel with whom any Indemnified Party may consult 
and all expenses of litigation or preparation therefor) which any 
Indemnified Party may incur or which may be asserted against any 
Indemnified Party in connection with or arising out of the matters 
referred to in this Agreement or in the other Loan Documents by any 
person, entity or governmental authority (including any person or entity 
claiming derivatively on behalf of the Borrower), whether (a) arising 
from or incurred in connection with any breach of a representation, 
warranty or covenant by the Borrower, or (b) arising out of or resulting 
from any suit, action, claim, proceeding or governmental investigation, 
pending or threatened, whether based on statute, regulation or order, or 
tort, or contract or otherwise, before any court or governmental 
authority, which arises out of or relates to this Agreement, any other 
Loan Document, or the use of the proceeds of the Loan; provided, 
however, that the foregoing indemnity agreement shall not apply to 
claims, damages, losses, liabilities and expenses solely attributable to 
an Indemnified Party's gross negligence or willful misconduct.  The 
indemnity agreement contained in this Section shall survive the 
termination of this Agreement, payment of any Loan and assignment of any 
rights hereunder.  The Borrower may participate at its expense in the 
defense of any such action or claim.

30.  Assignments and Participations.  At any time, without any notice 
to the Borrower, the Bank may sell, assign, transfer, negotiate, grant 
participation in, or otherwise dispose of all or any part of the Bank's 
interest in the Loans.  The Borrower hereby authorizes the Bank to 
provide, without any notice to the Borrower, any information concerning 
the Borrower, including information pertaining to the Borrower's 
financial condition, business operations or general creditworthiness, to 
any person or entity which may succeed to or participate in all or any 
part of the Bank's interest in the Loans.

31.   Consent to Jurisdiction.   The Borrower hereby agrees that any 
action or proceeding arising out of or relating to this Agreement or the 
other Loan Documents may be commenced in, and Borrower irrevocably 
consents to the exclusive jurisdiction of, any state or federal court 
located for the county or judicial district where the Bank's office 
indicated above is located, and consents that all service of process be 
sent by nationally recognized overnight courier service directed to the 
Borrower at the Borrower's address set forth herein and service so made 
will be deemed to be completed on the business day after deposit with 
such courier; provided that nothing contained in this Agreement will 
prevent the Bank from bringing any action, enforcing any award or 
judgment or exercising any rights against the Borrower individually, 
against any security or against any property of the Borrower within any 
other county, state or other foreign or domestic jurisdiction.  The 
Borrower acknowledges and agrees that the venue provided above is the 
most convenient forum for both the Bank and the Borrower.  The Borrower 
waives any objection to venue and any objection based on a more 
convenient forum in any action instituted under this Agreement or any 
other Loan Document.


32.  WAIVER OF JURY TRIAL.  THE BORROWER AND THE BANK IRREVOCABLY WAIVE 
ANY AND ALL RIGHTS THEY MAY HAVE TO A TRIAL BY JURY IN ANY ACTION, 
PROCEEDING OR CLAIM OF ANY NATURE RELATING TO THIS AGREEMENT OR ANY 
OTHER LOAN DOCUMENTS OR ANY TRANSACTION CONTEMPLATED IN ANY OF SUCH LOAN 
DOCUMENTS.  THE BORROWER AND THE BANK ACKNOWLEDGE THAT THE FOREGOING 
WAIVER IS KNOWING AND VOLUNTARY.

If the foregoing accurately reflects the understanding of the parties, 
please execute the duplicate original of this Agreement and the other 
Loan Documents and return them to me.

Very truly yours,

PNC BANK, NATIONAL ASSOCIATION   

By:           /s/ Eric Bruno
Eric Bruno, Assistant Vice President

Agreed to and accepted, with the intent to be legally bound,
this 26th day of March, 1999 

II-VI INCORPORATED

By:          /s/ James Martinelli

Name:       James Martinelli
Title: Treasurer and Chief Financial Officer





 




               SCHEDULE I TO LETTER AGREEMENT


                       Defined Terms

In addition to the words and terms defined elsewhere in the Agreement, 
the following words and terms shall have the following respective 
meanings:  

Advances shall have the meaning assigned to such term in Section 2(a) of 
the Agreement.  

Applicable Commitment Fee Rate shall mean the percentage rate per annum 
based on the Leverage Ratio then in effect according to the pricing grid 
on Schedule II to the Agreement across from the heading "Commitment 
Fee".   The Applicable Commitment Fee Rate shall be computed in 
accordance with the parameters set forth on Schedule II to the 
Agreement.   

Applicable Margin shall mean the respective percentage spread to be 
added to the Base Rate under the Base Rate Option and the Euro Rate 
under the Euro-Rate Option based on the Leverage Ratio then in effect 
according to the pricing grid on Schedule II to the Agreement across 
from the headings "Base Rate" and "Euro-Rate", respectively.  The 
Applicable Margin shall be computed in accordance with the parameters 
set forth on Schedule II to the Agreement.     
Base Rate shall mean the greater of (i) the Prime Rate, or (ii) the 
Federal Funds Effective Rate plus fifty (50) basis points (0.50%) per 
annum.

Base Rate Option shall mean the interest rate option described in 
Section 2(e)(i) of the Agreement.

Borrowing Date shall mean, with respect to any Advance, the date for the 
making thereof or the renewal or conversion thereof at or to the same or 
a different Interest Rate Option, which shall be a Business Day.

Business Day shall mean any day other than a Saturday or Sunday or a 
legal holiday on which commercial banks are authorized or required to be 
closed for business in Pittsburgh, Pennsylvania; and (i) if the 
applicable Business Day relates to any Advance to which the Euro-Rate 
Option applies, such day must also be a day on which dealings are 
carried on in the London interbank market, (ii) with respect to advances 
or payments of Advances or any other matters relating to Advances 
denominated in an Optional Currency, such day also shall be a day on 
which dealings in deposits in the relevant Optional Currency are carried 
on in the applicable interbank market, and (iii) with respect to 
advances or payments of Advances denominated in an Optional Currency, 
such day shall also be a day on which all applicable banks into which 
Advance proceeds may be deposited are open for business and foreign 
exchange markets are open for business in the principal financial center 
of the country of such currency. 

Capital Expenditures shall mean, for any period, the sum of, without 
duplication, (a) all cash expenditures made, directly or indirectly, by 
the Borrower and any of its Subsidiaries during such period for 
equipment, fixed assets, real property or improvements, or for 
replacements or substitutions therefor or additions thereto, that have 
been or should be, in accordance with GAAP, reflected as additional 
property, plant or equipment on a consolidated balance sheet of the 
Borrower and its Subsidiaries.

Cash Collateral Account shall have the meaning assigned to such term in 
Section 15 of the Agreement. 

Closing Date shall mean the date upon which this Agreement has been 
executed by the Borrower and the Bank and all conditions precedent 
specified in Section 9 of the Agreement have been satisfied or waived by 
the Bank.

Commitment Fee shall have the meaning assigned to such term in Section 
19 of the Agreement. 

Compliance Certificate shall have the meaning assigned to such term in 
Section 10(b) of the Agreement. 

Computation Date shall have the meaning assigned to such term in Section 
2(h) of the Agreement.
 
Control shall mean the possession, directly or indirectly, of the power 
to direct or cause the direction of the management or policies of a 
Person, whether through the ownership of voting securities, by contract 
or otherwise, including the power to elect a majority of the directors 
or trustees of a corporation or trust, as the case may be.

Conversion Date shall mean the date upon which the Advances (or a 
portion thereof) are converted to a term loan in accordance with Section 
2(n) of the Agreement.

Cost of Prepayment shall have the meaning assigned to such term in 
Section 2(m) of the Agreement. 

Default shall mean any event or condition which with notice or passage 
of time or both would constituted an Event of Default.

Default Rate shall have the meaning assigned to such term in Section 
2(f) of the Agreement. 

Dollar, Dollars, U.S. Dollars and the symbol $ shall mean the lawful 
currency of the United States of America.

Dollar Equivalent shall mean, with respect to any amount of any 
currency, the Equivalent Amount of such currency expressed in Dollars.


Dollar Equivalent Line of Credit Usage shall mean at any time the sum of 
(i) the Dollar Equivalent amount of Advances then outstanding and (ii) 
the Dollar Equivalent amount of Letters of Credit Outstanding.

EBIT shall mean, for any period, the consolidated net income (or net 
loss) of the Borrower and its Subsidiaries for such period as determined 
in accordance with GAAP, plus (a) the sum of (i) interest expense, (ii) 
income tax expense, (iii) extraordinary or unusual losses deducted in 
calculating net income, (iv) to the extent deducted in calculating net 
income (or net loss), other non-cash charges, less (b) the sum of (i) 
extraordinary or unusual gains added in calculating net income, (ii) to 
the extent added in calculating net income (or net loss), other non-cash 
credits.

EBITDA shall mean, for any period, the consolidated net income (or net 
loss) of the Borrower and its Subsidiaries for such period as determined 
in accordance with GAAP, plus (a) the sum of (i) interest expense, (ii) 
income tax expense, (iii) depreciation expense, (iv) amortization 
expense, (v) extraordinary or unusual losses deducted in calculating net 
income, (vi) to the extent deducted in calculating net income (or net 
loss), other non-cash charges, less (b) the sum of (i) extraordinary or 
unusual gains added in calculating net income, (ii) to the extent added 
in calculating net income (or net loss), other non-cash credits.

Equivalent Amount shall mean, at any time, as determined by Bank (which 
determination shall be conclusive absent manifest error), with respect 
to an amount of any currency (the "Reference Currency") which is to be 
computed as an equivalent amount of another currency (the "Equivalent 
Currency"): (i) if the Reference Currency and the Equivalent Currency 
are the same, the amount of such Reference Currency, or (ii) if the 
Reference Currency and the Equivalent Currency are not the same, the 
amount of such Equivalent Currency converted from such Reference 
Currency at Bank's spot selling rate (based on the market rates then 
prevailing and available to Bank) for the sale of such Equivalent 
Currency for such Reference Currency at a time determined by Bank on the 
second Business Day immediately preceding the event for which such 
calculation is made.

Equivalent Currency shall have the meaning assigned to such term in the 
definition of Equivalent Amount.

Euro shall have the meaning assigned to such term in Section 2(h)(vii) 
of the Agreement.

Euro-Rate shall mean the following:  (A) with respect to any Advances 
denominated in Dollars comprising any portion to which the Euro-Rate 
Option applies for any Euro-Rate Interest Period, the interest rate per 
annum determined by the Bank by dividing (the resulting quotient rounded 
upwards, if necessary, to the nearest 1/100th of 1% per annum) (i) the 
rate of interest determined by the Bank in accordance with its usual 
procedures (which determination shall be conclusive absent manifest 
error) to be the average of the London interbank offered rates for U.S. 
Dollars quoted by the British Bankers' Association as set forth on Dow 
Jones Markets Service (formerly known as Telerate) display page 3750 (or 
appropriate successor or, if the British Bankers' Association or its 
successor ceases to provide such quotes, a comparable replacement 
determined by the Bank) as of approximately 11:00 a.m. Greenwich Mean 
Time two (2) Business Days prior to the first day of such Euro-Rate 
Interest Period for an amount comparable to such Advance and having a 
borrowing date and a maturity comparable to such Euro-Rate Interest 
Period by (ii) a number equal to 1.00 minus the Euro-Rate Reserve 
Percentage.  Such Euro-Rate may also be expressed by the following 
formula:



              Average of London interbank offered rates on Dow Jones 
              Markets Service display page 3750 as quoted by
Euro-Rate =   British Bankers' Association or appropriate successor
              -----------------------------------------------------
                     1.00 - Euro-Rate Reserve Percentage

(B)  with respect to any Advances denominated in Optional Currency 
comprising any portion to which the Euro-Rate Option applies for any 
Euro-Rate Interest Period, the interest rate per annum determined by 
Bank by dividing (the resulting quotient rounded upward to the nearest 
1/100th of 1 percent per annum) (i) the rate of interest per annum 
determined by Bank in accordance with its usual procedures (which 
determination shall be conclusive absent manifest error) to be the rate 
of interest per annum for deposits in the relevant Optional Currency 
quoted by British Bankers' Association and which appears on the relevant 
Telerate Page (or, if no such quotation is available on such Telerate 
Page, on the appropriate Reuters Screen) at approximately 9:00 a.m., 
Pittsburgh time, two (2) Business Days prior to the first day of such 
Euro-Rate Interest Period for delivery on the first day of such Euro-
Rate Interest Period for a period, and in an amount, comparable to such 
Euro-Rate Interest Period and principal amount of such Advance ("LIBO 
Rate") by (ii) a number equal to 1.00 minus the Euro-Rate Reserve 
Percentage.   Such Euro-Rate may also be expressed by the following 
formula:

                                     LIBO Rate
        Euro-Rate   =
                         1 - Euro-Rate Reserve Percentage

The Euro-Rate shall be adjusted with respect to any Euro-Rate Option 
outstanding on the effective date of any change in the Euro-Rate Reserve 
Percentage as of such effective date.  The Bank shall give prompt notice 
to the Borrower of the Euro-Rate as determined or adjusted in accordance 
herewith, which determination shall be conclusive absent manifest error.  
The Euro-Rate for any Advances shall be based upon the Euro-Rate for the 
currency in which such Advances are requested.

Euro-Rate Interest Period shall mean the period of one (1), two (2), 
three (3) or six (6) months selected by the Borrower commencing on the 
date of disbursement of an Advance and each successive period selected 
by the Borrower thereafter; provided, that if a Euro-Rate Interest 
Period would end on a day which is not a Business Day, it shall end on 
the next succeeding Business Day, unless such day falls in the 
succeeding calendar month in which case the Euro-Rate Interest Period 
shall end on the next preceding Business Day.  In no event shall any 
Euro-Rate Interest Period end on a day after the Expiration Date.

Euro-Rate Option shall mean the interest rate option described in 
Section 2(e)(ii) of the Agreement.

Euro-Rate Reserve Percentage shall mean the maximum percentage 
(expressed as a decimal rounded upward to the nearest 1/100 of 1%) as 
determined by the Agent which is in effect during any relevant period as 
prescribed by the Board of Governors of the Federal Reserve System (or 
any successor) for determining the reserve requirements (including 
supplemental, marginal and emergency reserve requirements) with respect 
to eurocurrency funding (currently referred to as "Eurocurrency 
Liabilities") of a member bank in such System.  

Event of Default shall have the meaning assigned to such term in Section 
14 of the Agreement. 

Expiration Date means March 25, 2000, or such later date as may be 
designated by the Bank in writing its sole discretion in accordance with 
Section 2(b) of the Agreement.

Extension Request shall have the meaning assigned to such term in 
Section 2(b) of the Agreement. 

Federal Funds Effective Rate shall mean for any day the rate per annum 
(based on a year of 360 days and actual days elapsed and rounded upward 
to the nearest 1/100 of 1%) announced by the Federal Reserve Bank of New 
York (or any successor) on such day as being the weighted average of the 
rates on overnight federal funds transactions arranged by federal funds 
brokers on the previous trading day, as computed and announced by such 
Federal Reserve Bank (or any successor) in substantially the same manner 
as such Federal Reserve Bank computes and announces the weighted average 
it refers to as the "Federal Funds Effective Rate" as of the date of 
this Agreement; provided, if such Federal Reserve Bank (or its 
successor) does not announce such rate on any day, the "Federal Funds 
Effective Rate" for such day shall be the Federal Funds Effective Rate 
for the last day on which such rate was announced. 

GAAP shall mean generally accepted accounting principles in effect from 
time to time consistently applied from period to period subject in the 
case of interim statements to normal year-end adjustments.

Guarantor shall mean each of the Borrower's domestic subsidiaries as 
listed on Schedule III attached to the Agreement, and any other 
guarantor of the obligations of the Borrower to the Bank existing on the 
date of the Agreement or arising in the future.

Guarantees shall have the meaning assigned to such term in Section 7 of 
the Agreement. 

Initial Expiration Date shall mean the date that is 364 days from the 
date of the Agreement. 

Interest Coverage Ratio shall mean the ratio of EBIT to the consolidated 
interest expense of the Borrower and its Subsidiaries, measured on a 
rolling four fiscal quarter basis.

Interest Rate Option shall mean the Base Rate Option or the Euro-Rate 
Option.

Letter of Credit shall have the meaning assigned to that term in Section 
3(a) of the Agreement.

Letter of Credit Fee shall have the meaning assigned to that term in 
Section 20 of the Agreement.

Letters of Credit Outstanding shall mean at any time the sum of (i) the 
aggregate undrawn Stated Amount of outstanding Letters of Credit and 
(ii) the aggregate amount of all unpaid and outstanding Reimbursement 
Obligations.

Leverage Ratio shall mean the ratio of Total Indebtedness to EBITDA, 
measured on a rolling  four fiscal quarter basis.

Line of Credit shall have the meaning assigned to such term in Section 
2(a) of the Agreement. 

Line of Credit Commitment shall mean $15,000,000, as the same may be 
reduced pursuant to Sections 2(o) of the Agreement.

Line of Credit Note shall have the meaning assigned to such term in 
Section 2(c) of the Agreement.

Loans shall mean the Line of Credit, the Rate Protection Term Loan and 
the Term Loan (if applicable).

Loan Documents shall have the meaning assigned to such term in Section 6 
of the Agreement. 

Material Adverse Change shall mean any set of circumstances or events 
which (a) has or could reasonably be expected to have any material 
adverse effect upon the validity or enforceability of the Agreement or 
any of the other Loan Documents, (b) is or could reasonably be expected 
to be material and adverse to the business, properties, assets, 
financial condition or results of operations of the Borrower and its 
Subsidiaries, taken as a whole, (c) impairs materially or could 
reasonably be expected to impair materially the ability of the Borrower 
and its Subsidiaries taken as a whole to duly and punctually pay their 
indebtedness, or (d) impairs materially or could reasonably be expected 
to impair materially the ability of the Bank to enforce its legal 
remedies pursuant to the Agreement or any other Loan Document. 

Notes shall mean the Line of Credit Note, the Rate Protection Term Note 
and the Term Note (if applicable).

Obligor means the Borrower and each Guarantor.

Optional Currency shall mean any of the following currencies (a) the 
Australian dollar, (b) the British Pound Sterling, (c) the Canadian 
dollar, (d) the Deutsche Mark, (e) the Italian Lira, (f) the Japanese 
Yen, (g) the Spanish Peseta, and (h) the Singapore dollar, and any other 
freely convertible foreign currency, as determined pursuant to the 
currency codes in effect from time to time under ISO International 
Standard 4217 or any successor thereto and as  approved by the Bank in 
writing in its sole discretion.

Original Currency shall have the meaning assigned to such term in 
Section 2(j)(i) of the Agreement.

Other Currency shall have the meaning assigned to such term in Section 
2(j)(i) of the Agreement.

Other Taxes shall have the meaning assigned to such term in Section 
2(i)(ii) of the Agreement. 

Overnight Rate shall mean for any day with respect to any Advances in an 
Optional Currency, the rate of interest per annum as determined by the 
Bank at which overnight deposits in the such currency, in an amount 
approximately equal to the amount with respect to which such rate is 
being determined, would be offered for such day in the applicable 
offshore interbank market.

Permitted Acquisitions shall mean acquisitions by the Borrower of all or 
substantially all of the assets or capital stock of any Person, provided 
that (i) such Person is in a similar line of business as carried on by 
the Borrower on the date of this Agreement, (ii) the board of directors 
or other applicable governing body shall have consented to and approved 
such acquisition, (iii) at the time of such acquisition no Event of 
Default or Default then exists or would result therefrom, (iv) each of 
the representations and warranties contained in Section 13 of the 
Agreement shall be true and correct in all material respects both before 
and after giving effect to such acquisition, and (v) any liens or 
indebtedness assumed or issued in connection with such acquisition are 
otherwise permitted under Section 11(b) or 11(c) of the Agreement.  
Permitted Stock Repurchases shall mean the repurchase by Borrower of 
shares of its capital stock, provided that the aggregate consideration 
paid in connection with all such Permitted Stock Repurchases shall not 
exceed $5,000,000 at any time.

Person shall mean any individual, company, partnership, limited 
liability company, joint venture, corporation, association, business 
trust, unincorporated organization, or any other entity.

Prime Rate shall mean for any day the rate publicly announced by the 
Bank from time to time as its prime rate, which rate is not tied to any 
external rate of interest or index and does not necessarily reflect the 
lowest rate of interest actually charged by the Bank to any particular 
class or category of customers.

Reimbursement Agreement shall have the meaning assigned to such term in 
Section 3(a) of the Agreement. 

Reimbursement Obligation shall mean the obligation of the Borrower to 
reimburse the Bank in an amount equal to the Dollar Equivalent amount(s) 
paid by the Bank under the Letters of Credit, plus accrued interest 
thereon.

Reference Currency shall have the meaning assigned to such term in the 
definition of Equivalent Amount.

Seller Notes shall mean any notes issued by the Borrower in connection 
with any Permitted Acquisition, the payment of which are subject to the 
terms and conditions of a Subordination Agreement executed in favor of 
the Bank.

Stated Amount shall mean as to any Letter of Credit, the lesser of (i) 
the face amount thereof, or (ii) the remaining available undrawn amount 
thereof (regardless of whether any conditions for drawing could then be 
met) 

Subordination Agreement shall mean a subordination agreement in form and 
content satisfactory to the Bank, whereby the payment of the Seller 
Notes are subordinated to the prior payment in full of all obligations 
owing by the Borrower to the Bank under the Loan Documents.

Subsidiary shall mean, at any time, any Person of which 50% or more (by 
number of shares or number of votes) of the outstanding capital stock or 
shares of beneficial interest normally entitled to vote for the election 
of one or more directors (regardless of any contingency which does or 
may suspend or dilute the voting rights) is at such time owned directly 
or indirectly through one or more Subsidiaries by Borrower (including, 
without limitation, the entities listed on Schedule III attached 
hereto), or (ii) any Person which is Controlled or capable of being 
Controlled by Borrower or one or more of Borrower's Subsidiaries.
Tangible Net Worth shall mean stockholder's equity in the Borrower less 
any advances to third parties and any items properly classified as 
intangibles, in accordance with generally accepted accounting 
principles.

Taxes shall have the meaning assigned to such term in Section 2(i)(i) of 
the Agreement. 

Term Conversion Request shall have the meaning assigned to such term in 
Section 2(n) of the Agreement.

Term Loan shall have the meaning assigned to such term in Section 2(n) 
of the Agreement. 

Term Note shall have the meaning assinged to such term in Section 2(n) 
of the Agreement.

Total Indebtedness shall mean any and all indebtedness, obligations or 
liabilities (whether matured or unmatured, liquidated or unliquidated, 
direct or indirect, absolute or contingent or joint and several) of the 
Borrower and its Subsidiaries for or in respect of: (i) borrowed money, 
(ii) amounts raised under or liabilities in respect of any note purchase 
or acceptance credit facility, (iii) reimbursement obligations 
(contingent or otherwise) under any letter of credit, currency swap 
agreement, hedging contracts, or other interest rate management device, 
raw materials management device or commodities management device (except 
raw materials or commodity management devices entered into in the 
ordinary course of business), (iv) any other transaction (including 
forward sale or purchase agreements, capitalized leases and conditional 
sales agreements) having the commercial effect of a borrowing of money 
entered into by Borrower or any of its Subsidiaries to finance its 
operations or capital requirements (but not including trade payables and 
accrued expenses incurred in the ordinary course of business which are 
not represented by a promissory note or other evidence of indebtedness), 
or (v) any guaranty of any of the foregoing.

Trigger Date shall have the meaning assigned to such term in Section 
8(a) of the Agreement.  

Year 2000 Problem shall have the meaning assigned to such term in 
Section 13(p) of the Agreement. 

 


<TABLE>

                                      SCHEDULE II TO LETTER AGREEMENT
                                             Pricing Grid  1
<CAPTION>
            LEVEL I            LEVEL II            LEVEL III           LEVEL IV            LEVEL V
<S>         <C>                <C>                 <C>                 <C>                 <C>

BASIS FOR   If the Leverage    If the Leverage     If the Leverage     If the Leverage     If the Leverage
PRICING     Ratio is less      Ratio is greater    Ratio is greater    Ratio is greater    Ratio is greater
            than or equal      than 0.75 to 1.0    than 1.0 to 1.0     than 1.5 to 1.0     than 2.0 to 1.0.
            to 0.75 to 1.0.    but less than or    but less than or    but less than or
                               equal to 1.0 to     equal to 1.5 to     equal to 2.0 to
                               1.0.                1.0.                1.0.
 
EURORATE +       75                  87.5                 100                 112.5              125

BASE RATE +       0                     0                   0                     0                0

COMMITMENT 
FEE             7.5                    10                 12.5                   15             17.5

</TABLE>

For purposes of determining the Applicable Margin and the Applicable Commitment
Fee Rate:

(a)  The Applicable Margin and the Applicable Commitment Fee Rate on the 
     Closing Date shall be those set forth under Level II.

(b)  The Applicable Margin and the Applicable Commitment Fee Rate shall be 
     recomputed as of the end of each fiscal quarter ending after the 
     Closing Date based on the Leverage Ratio as of such quarter end; provided
     that if the Borrower fails to deliver the financial statements required by 
     Section 10(b) and 10(d) of the Agreement and the related Compliance 
     Certificate by the 90th day after any fiscal year, or the 45th day after 
     any fiscal quarter, the Applicable Margin and the Applicable Commitment Fee
     Rate shall be those that would apply if the Leverage Ratio were greater 
     than 2.0 to 1.0 and shall apply until such financial statements and 
     Compliance Certificate are delivered.  Any increase or decrease in the 
     Applicable Margin or the Applicable Commitment Fee Rate computed as of a
     quarter end shall be effective on the date on which the Compliance 
     Certificate evidencing such computation is delivered under Section 10(b) 
     and 10(d) of the Agreement.


 

              SCHEDULE III TO LETTER AGREEMENT


Domestic Subsidiaries

Name                                  Jurisdiction of Incorporation

* II-VI Delaware, Incorporated                (Delaware)
* VLOC Incorporated                           (Pennsylvania)







Foreign Subsidiaries

Name                                  Jurisdiction of Incorporation

* II-VI Singapore Pte., Ltd.                  (Singapore)
* II-VI Worldwide, Incorporated               (Barbados)
* II-VI Japan Incorporated                    (Japan)
* II-VI U.K. Limited                          (United Kingdom)
* II-VI Optics (Suzhou) Co., Ltd.             (China)





























                  SCHEDULE IV TO LETTER AGREEMENT


                     Environmental Litigation
                     ------------------------


None

















































                  SCHEDULE V TO LETTER AGREEMENT


                       II-VI Incorporated



Capital Expenditures Budget for Fiscal Years Ended June 30, 1999, 2000 
and 2001 (Obtained from February 1999 Five Year Plan)




                           Fiscal Year      Fiscal Year      Fiscal Year
                              Ended            Ended            Ended
                         June 30, 1999    June 30, 2000    June 30, 2000
                         -------------    -------------    -------------

Total Capital 
Expenditures Budget       $6,545,900       $8,684,200       $7,404,900





































                  EXHIBIT "A" TO LETTER AGREEMENT

          AMENDED AND RESTATED COMMITTED LINE OF CREDIT NOTE


$15,000,000.00                                  Pittsburgh, Pennsylvania
                                                          March 26, 1999

FOR VALUE RECEIVED, the undersigned, II-VI INCORPORATED, a Pennsylvania 
corporation with an address at 375 Saxonburg Boulevard, Saxonburg, PA 
16056 (herein called the "Borrower"), hereby promises to pay to the 
order of PNC BANK, NATIONAL ASSOCIATION (the "Bank") the lesser of (i) 
the principal sum of FIFTEEN MILLION AND 00/100 U.S. Dollars (U.S. 
$15,000,000.00), or (ii) the aggregate unpaid principal balance of all 
Advances made by the Bank to the Borrower pursuant to Sections 2 and 3 
of the Letter Agreement dated as of March 26, 1999, between the Borrower 
and the Bank (as the same may be amended, modified, renewed or restated 
from time to time, the "Agreement"), payable on the Expiration Date.

The Borrower shall pay interest on the unpaid principal balance hereof 
from time to time outstanding from the date hereof at the rate or rates 
per annum and at the times as specified in the Agreement.

Upon the occurrence and during the continuation of an Event of Default, 
the Borrower shall pay interest on the entire principal amount of the 
then outstanding Advances evidenced by this Line of Credit Note at a 
rate per annum (based on a year of 360 days and actual days elapsed) 
equal to two hundred basis points (2% per annum) above the rate of 
interest otherwise applicable with respect to such Advances.  Such 
interest rate will accrue before and after any judgment has been 
entered.

If any payment or action to be made or taken hereunder shall be stated 
to be or become due on a day which is not a Business Day, such payment 
or action shall be made or taken on the next following Business Day and 
such extension of time shall be included in computing interest or fees, 
if any, in connection with such payment or action.

Subject to the provisions of the Agreement, payments of both principal 
and interest shall be made without setoff, counterclaim or other 
deduction of any nature at the office of the Bank located at 249 Fifth 
Avenue, Pittsburgh, Pennsylvania 15222-2707, in lawful money of the 
United States of America in immediately available funds.

This Note is the Line of Credit Note referred to in, and is entitled to 
the benefits of, the Agreement and other Loan Documents, including the 
representations, warranties, covenants, conditions, security interests 
or liens contained or granted therein.  The Agreement among other things 
contains provisions for acceleration of the maturity hereof upon the 
happening of certain stated events and also for prepayment, in certain 
circumstances, on account of principal hereof prior to maturity upon the 
terms and conditions therein specified.

All capitalized terms used herein shall, unless otherwise defined 
herein, have the same meanings given to such terms in the Agreement.

Except as otherwise provided in the Agreement, the Borrower waives 
presentment, demand, notice, protest and all other demands and notices 
in connection with the delivery, acceptance, performance, default or 
enforcement of this Line of Credit Note and the Agreement.

This Line of Credit Note shall bind the Borrower and its successors and 
assigns, and the benefits hereof shall inure to the benefit of the Bank 
and its successors and assigns.  All references herein to the "Borrower" 
and the "Bank" shall be deemed to apply to the Borrower and the Bank, 
respectively, and their respective successors and assigns.

This Line of Credit Note and any other documents delivered in connection 
herewith and the rights and obligations of the parties hereto and 
thereto shall for all purposes be governed by and construed and enforced 
in accordance with the internal laws of the Commonwealth of Pennsylvania 
without giving effect to its conflicts of law principles.

This Line of Credit Note amends and restates, and is in substitution 
for, that certain Committed Line of Credit Note in the original 
principal amount of $10,000,000 payable to the Bank and dated September 
25, 1997 (the "Existing Note").  However, without duplication, this Note 
shall in no way extinguish, cancel or satisfy Borrower's unconditional 
obligation to repay all indebtedness evidenced by the Existing Note or 
constitute a novation of the Existing Note.  Nothing herein is intended 
to extinguish, cancel  or impair the lien priority or effect of any 
security agreement, pledge agreement or mortgage with respect to the 
Borrower's obligations hereunder and under any other document relating 
hereto. 

WAIVER OF JURY TRIAL. THE BORROWER HEREBY WAIVES THE RIGHT TO TRIAL BY 
JURY IN ANY COURT AND IN ANY ACTION OR PROCEEDING OF ANY TYPE AS TO ALL 
MATTERS AND THINGS ARISING OUT OF THIS NOTE.

IN WITNESS WHEREOF, the undersigned has executed this Line of Credit 
Note by its duly authorized officers with the intention that it 
constitute a sealed instrument.


                [SEAL]                II-VI INCORPORATED


Attest:  /s/ Craig A. Creaturo        By:   /s/ James Martinelli

Name:     Craig A. Creaturo           Name:  James Martinelli

Title:   Corporate Controller         Title:  Treasurer and 
         II-VI Incorporated               Chief Financial Officer
 

 












                    EXHIBIT "B" TO LETTER AGREEMENT



Guaranty and Suretyship Agreement                               PNCBANK

THIS  GUARANTY  AND  SURETYSHIP  AGREEMENT (this "Guaranty") is made and 
entered into as of this 26th day of March, 1999,  by II-VI DELAWARE, 
INCORPORATED.  (the "Guarantor"), with an address at 103 Springer 
Building, 3411 Silverside Road, Wilmington, Delaware, 19810 in 
consideration of the extension of credit by PNC BANK, NATIONAL 
ASSOCIATION (the "Bank"), with an address at One PNC Plaza, 249 Fifth 
Avenue, Pittsburgh, Pennsylvania 15222-2707 to II-VI INCORPORATED, a 
Pennsylvania corporation with an address at 375 Saxonburg Blvd., 
Saxonburg, Pennsylvania 16056  (the "Borrower"), and other good and 
valuable consideration, the receipt and sufficiency of which are hereby 
acknowledged.

1.  Guaranty of Obligations.  The Guarantor hereby guarantees, and 
becomes surety for, the prompt payment and performance of all loans, 
advances, debts, liabilities, obligations, covenants and duties owing by 
the Borrower to the Bank or to any other direct or indirect subsidiary 
of PNC Bank Corp., of any kind or nature, present or future (including 
any interest accruing thereon after maturity, or after the filing of any 
petition in bankruptcy, or the commencement of any insolvency, 
reorganization or like proceeding relating to the Borrower, whether or 
not a claim for post-filing or post-petition interest is allowed in such 
proceeding), whether or not evidenced by any note, guaranty or other 
instrument, whether arising under any agreement, instrument or document, 
whether or not for the payment of money, whether arising by reason of an 
extension of credit, opening of a letter of credit, loan, equipment 
lease or guarantee, under any interest or currency swap, future, option 
or other interest rate protection or similar agreement, or in any other 
manner, whether arising out of overdrafts on deposit or other accounts 
or electronic funds transfers (whether through automated clearing houses 
or otherwise) or out of the Bank's non-receipt of or inability to 
collect funds or otherwise not being made whole in connection with 
depository transfer check or other similar arrangements, whether direct 
or indirect (including those acquired by assignment or participation), 
absolute or contingent, joint or several, due or to become due, now 
existing or hereafter arising, and any amendments, extensions, renewals 
or increases and all costs and expenses of the Bank incurred in the 
documentation, negotiation, modification, enforcement, collection or 
otherwise in connection with any of the foregoing, including reasonable 
attorneys' fees and expenses (hereinafter referred to collectively as 
the "Obligations").  If the Borrower defaults under any such 
Obligations, the Guarantor will pay the amount due to the Bank.

2.  Nature of Guaranty; Waivers.  This is a guaranty of payment and not 
of collection and the Bank shall not be required, as a condition of the 
Guarantor's liability, to make any demand upon or to pursue any of its 
rights against the Borrower, or to pursue any rights which may be 
available to it with respect to any other person who may be liable for 
the payment of the Obligations.  
This is an absolute, unconditional, irrevocable and continuing guaranty 
and will remain in full force and effect until all of the Obligations 
have been indefeasibly paid in full, and the Bank has terminated this 
Guaranty.  This Guaranty will remain in full force and effect even if 
there is no principal balance outstanding under the Obligations at a 
particular time or from time to time.  This Guaranty will not be 
affected by any surrender, exchange, acceptance, compromise or release 
by the Bank of any other party, or any other guaranty or any security 
held by it for any of the Obligations, by any failure of the Bank to 
take any steps to perfect or maintain its lien or security interest in 
or to preserve its rights to any security or other collateral for any of 
the Obligations or any guaranty, or by any irregularity, 
unenforceability or invalidity of any of the Obligations or any part 
thereof or any security or other guaranty thereof.  The Guarantor's 
obligations hereunder shall not be affected, modified or impaired by any 
counterclaim, set-off, deduction or defense based upon any claim the 
Guarantor may have against the Borrower or the Bank, except payment or 
performance of the Obligations.

Notice of acceptance of this Guaranty, notice of extensions of credit to 
the Borrower from time to time, notice of default, diligence, 
presentment, notice of dishonor, protest, demand for payment, and any 
defense based upon the Bank's failure to comply with the notice 
requirements of the applicable version of Uniform Commercial Code ss 9-
504 are hereby waived.  The Guarantor waives all defenses based on 
suretyship or impairment of collateral.

The Bank at any time and from time to time, without notice to or the 
consent of the Guarantor, and without impairing or releasing, 
discharging or modifying the Guarantor's liabilities hereunder, may (a) 
change the manner, place, time or terms of payment or performance of or 
interest rates on, or other terms relating to, any of the Obligations; 
(b) renew, substitute, modify, amend or alter, or grant consents or 
waivers relating to any of the Obligations, any other guaranties, or any 
security for any Obligations or guaranties; (c) apply any and all 
payments by whomever paid or however realized including any proceeds of 
any collateral, to any Obligations of the Borrower in such order, manner 
and amount as the Bank may determine in its sole discretion; (d) settle, 
compromise or deal with any other person, including the Borrower or the 
Guarantor, with respect to any Obligations in such manner as the Bank 
deems appropriate in its sole discretion; (e) substitute, exchange or 
release any security or guaranty; or (f) take such actions and exercise 
such remedies hereunder as provided herein.

3.  Repayments or Recovery from the Bank.  If any demand is made at any 
time upon the Bank for the repayment or recovery of any amount received 
by it in payment or on account of any of the Obligations and if the Bank 
repays all or any part of such amount by reason of any judgment, decree 
or order of any court or administrative body or by reason of any 
settlement or compromise of any such demand, the Guarantor will be and 
remain liable hereunder for the amount so repaid or recovered to the 
same extent as if such amount had never been received originally by the 
Bank.  The provisions of this section will be and remain effective 
notwithstanding any contrary action which may have been taken by the 
Guarantor in reliance upon such payment, and any such contrary action so 
taken will be without prejudice to the Bank's rights hereunder and will 
be deemed to have been conditioned upon such payment having become final 
and irrevocable.

4.  Financial Statements.  Unless compliance is waived in writing by 
the Bank or until all of the Obligations have been paid in full, the 
Guarantor will promptly submit to the Bank such information relating to 
the Guarantor's affairs (including but not limited to annual financial 
statements and tax returns for the Guarantor) or any security for the 
Guaranty as the Bank may reasonably request.

5.  Enforceability of Obligations.  No modification, limitation or 
discharge of the Obligations arising out of or by virtue of any 
bankruptcy, reorganization or similar proceeding for relief of debtors 
under federal or state law will affect, modify, limit or discharge the 
Guarantor's liability in any manner whatsoever and this Guaranty will 
remain and continue in full force and effect and will be enforceable 
against the Guarantor to the same extent and with the same force and 
effect as if any such proceeding had not been instituted.  The Guarantor 
waives all rights and benefits which might accrue to it by reason of any 
such proceeding and will be liable to the full extent hereunder, 
irrespective of any modification, limitation or discharge of the 
liability of the Borrower that may result from any such proceeding.

6.  Events of Default.  The occurrence of any of the following shall be 
an "Event of Default" hereunder:  (i) any Event of Default (as defined 
in any of the Obligations); (ii) any default under any of the 
Obligations that does not have a defined set of "Events of Default" and 
the lapse of any notice or cure period provided in such Obligations with 
respect to such default; (iii) demand by the Bank under any of the 
Obligations that have a demand feature; (iv) the Guarantor's failure to 
perform any of its obligations hereunder; (v) the falsity, inaccuracy or 
material breach by the Guarantor of any written warranty, representation 
or statement made or furnished to the Bank by or on behalf of the 
Guarantor; or (vi) the termination or attempted termination of this 
Guaranty.  Upon the occurrence of any Event of Default, (a) the 
Guarantor shall pay to the Bank the amount of the Obligations; or (b) on 
demand of the Bank, the Guarantor shall immediately deposit with the 
Bank, in U.S. dollars, all amounts due or to become due under the 
Obligations, and the Bank may at any time use such funds to repay the 
Obligations; or (c) the Bank in its discretion may exercise with respect 
to any collateral any one or more of the rights and remedies provided a 
secured party under the applicable version of the Uniform Commercial 
Code; or (d) the Bank in its discretion may exercise from time to time 
any other rights and remedies available to it at law, in equity or 
otherwise.

7.  Right of Setoff.  In addition to all liens upon and rights of setoff 
against the Guarantor's money, securities or other property given to the 
Bank by law, the Bank shall have, with respect to the Guarantor's 
obligations to the Bank under this Guaranty and to the extent permitted 
by law, a contractual possessory security interest in and a contractual 
right of setoff against, and the Guarantor hereby assigns, conveys, 
delivers, pledges and transfers to the Bank all of the Guarantor's 
right, title and interest in and to, all of the Guarantor's deposits, 
moneys, securities and other property now or hereafter in the possession 
of or on deposit with, or in transit to, the Bank or any other direct or 
indirect subsidiary of PNC Bank Corp., whether held in a general or 
special account or deposit, whether held jointly with someone else, or 
whether held for safekeeping or otherwise, excluding, however, all IRA, 
Keogh, and trust accounts.  Every such security interest and right of 
setoff may be exercised without demand upon or notice to the Guarantor.  
Every such right of setoff shall be deemed to have been exercised 
immediately upon the occurrence of an Event of Default hereunder without 
any action of the Bank, although the Bank may enter such setoff on its 
books and records at a later time.

8.  Collateral.   This Guaranty is secured by the property described in 
any collateral security documents which the Guarantor executes and 
delivers to the Bank and by such other collateral as previously may have 
been or may in the future be granted to the Bank to secure any 
obligations of the Guarantor to the Bank.

9.  Costs.  To the extent that the Bank incurs any costs or expenses in 
protecting or enforcing its rights under the Obligations or this 
Guaranty, including reasonable attorneys' fees and the costs and 
expenses of litigation, such costs and expenses will be due on demand, 
will be included in the Obligations and will bear interest from the 
incurring or payment thereof at the Default Rate (as defined in any of 
the Obligations).

10.  Postponement of Subrogation.  Until the Obligations are 
indefeasibly paid in full, the Guarantor postpones and subordinates in 
favor of the Bank any and all rights which the Guarantor may have to (a) 
assert any claim against the Borrower based on subrogation rights with 
respect to payments made hereunder, and (b) any realization on any 
property of the Borrower, including participation in any marshalling of 
the Borrower's assets. 

11.  Power to Confess Judgment.  The Guarantor hereby empowers any 
attorney of any court of record, after the occurrence of any Event of 
Default hereunder, to appear for the Guarantor and, with or without 
complaint filed, confess judgment, or a series of judgments, against the 
Guarantor in favor of the Bank for the amount of the Obligations and an 
attorney's commission of the greater of 10% of such principal and 
interest or $1,000 added as a reasonable attorney's fee, and for doing 
so, this Guaranty or a copy verified by affidavit shall be a sufficient 
warrant.  The Guarantor hereby forever waives and releases all errors in 
said proceedings and all rights of appeal and all relief from any and 
all appraisement, stay or exemption laws of any state now in force or 
hereafter enacted. 

No single exercise of the foregoing power to confess judgment, or a 
series of judgments, shall be deemed to exhaust the power, whether or 
not any such exercise shall be held by any court to be invalid, 
voidable, or void, but the power shall continue undiminished and it may 
be exercised from time to time as often as the Bank shall elect until 
such time as the Bank shall have received payment in full of the 
Obligations and costs.  Notwithstanding the attorney's  commission 
provided for in the preceding paragraph (which is included in the 
warrant for purposes of establishing a sum certain), the amount of 
attorneys' fees that the Bank may recover from the Guarantor shall not 
exceed the actual attorneys' fees incurred by the Bank.

12.  Notices.  All notices, demands, requests, consents, approvals and 
other communications required or permitted hereunder must be in writing 
and will be effective upon receipt.  Such notices and other 
communications may be hand-delivered, sent by facsimile transmission 
with confirmation of delivery and a copy sent by first-class mail, or 
sent by nationally recognized overnight courier service, to the 
addresses for the Bank and the Guarantor set forth above or to such 
other address as one may give to the other in writing for such purpose.

13.  Preservation of Rights.  No delay or omission on the Bank's part to 
exercise any right or power arising hereunder will impair any such right 
or power or be considered a waiver of any such right or power, nor will 
the Bank's action or inaction impair any such right or power.  The 
Bank's rights and remedies hereunder are cumulative and not exclusive of 
any other rights or remedies which the Bank may have under other 
agreements, at law or in equity.  The Bank may proceed in any order 
against the Borrower, the Guarantor or any other obligor of, or 
collateral securing, the Obligations.

14.  Illegality.  In case any one or more of the provisions contained in 
this Guaranty should be invalid, illegal or unenforceable in any 
respect, the validity, legality and enforceability of the remaining 
provisions contained herein shall not in any way be affected or impaired 
thereby.

15.  Changes in Writing.  No modification, amendment or waiver of any 
provision of this Guaranty nor consent to any departure by the Guarantor 
therefrom will be effective unless made in a writing signed by the Bank, 
and then such waiver or consent shall be effective only in the specific 
instance and for the purpose for which given.  No notice to or demand on 
the Guarantor in any case will entitle the Guarantor to any other or 
further notice or demand in the same, similar or other circumstance.

16.  Entire Agreement.  This Guaranty (including the documents and 
instruments referred to herein) constitutes the entire agreement and 
supersedes all other prior agreements and understandings, both written 
and oral, between the Guarantor and the Bank with respect to the subject 
matter hereof; provided, however, that this Guaranty is in addition to, 
and not in substitution for, any other guarantees from the Guarantor to 
the Bank.

17.  Successors and Assigns.  This Guaranty will be binding upon and 
inure to the benefit of the Guarantor and the Bank and their respective 
heirs, executors, administrators, successors and assigns; provided, 
however, that the Guarantor may not assign this Guaranty in whole or in 
part without the Bank's prior written consent and the Bank at any time 
may assign this Guaranty in whole or in part.

18.  Interpretation.  In this Guaranty, unless the Bank and the 
Guarantor otherwise agree in writing, the singular includes the plural 
and the plural the singular; references to statutes are to be construed 
as including all statutory provisions consolidating, amending or 
replacing the statute referred to; the word "or" shall be deemed to 
include "and/or", the words "including", "includes" and "include" shall 
be deemed to be followed by the words "without limitation"; and 
references to sections or exhibits are to those of this Guaranty unless 
otherwise indicated.  Section headings in this Guaranty are included for 
convenience of reference only and shall not constitute a part of this 
Guaranty for any other purpose.  If this Guaranty is executed by more 
than one party as Guarantor, the obligations of such persons or entities 
will be joint and several.

19.  Indemnity.  The Guarantor agrees to indemnify each of the Bank, its 
directors, officers and employees and each legal entity, if any, who 
controls the Bank (the "Indemnified Parties") and to hold each 
Indemnified Party harmless from and against any and all claims, damages, 
losses, liabilities and expenses (including all reasonable fees and 
charges of internal or external counsel with whom any Indemnified Party 
may consult and all expenses of litigation or preparation therefor) 
which any Indemnified Party may incur or which may be asserted against 
any Indemnified Party as a result of the execution of or performance 
under this Guaranty; provided, however, that the foregoing indemnity 
agreement shall not apply to claims, damages, losses, liabilities and 
expenses solely attributable to an Indemnified Party's gross negligence 
or willful misconduct.  The indemnity agreement contained in this 
Section shall survive the termination of this Guaranty.  The Guarantor 
may participate at its expense in the defense of any such claim.

20.  Governing Law and Jurisdiction.  This Guaranty has been delivered 
to and accepted by the Bank and will be deemed to be made in the State 
where the Bank's office indicated above is located.  THIS GUARANTY WILL 
BE INTERPRETED AND THE RIGHTS AND LIABILITIES OF THE BANK AND THE 
GUARANTOR DETERMINED IN ACCORDANCE WITH THE LAWS OF THE STATE WHERE THE 
BANK'S OFFICE INDICATED ABOVE IS LOCATED, EXCLUDING ITS CONFLICT OF LAWS 
RULES.  The Guarantor hereby irrevocably consents to the exclusive 
jurisdiction of any state or federal court in the county or judicial 
district where the Bank's office indicated above is located; provided 
that nothing contained in this Guaranty will prevent the Bank from 
bringing any action, enforcing any award or judgment or exercising any 
rights against the Guarantor individually, against any security or 
against any property of the Guarantor within any other county, state or 
other foreign or domestic jurisdiction.  The Guarantor acknowledges and 
agrees that the venue provided above is the most convenient forum for 
both the Bank and the Guarantor.  The Guarantor waives any objection to 
venue and any objection based on a more convenient forum in any action 
instituted under this Guaranty.

21.  Equal Credit Opportunity Act.  If the Guarantor is not an 
"applicant for credit" under Section 202.2 (e) of the Equal Credit 
Opportunity Act of 1974 ("ECOA"), the Guarantor acknowledges that (i) 
this Guaranty has been executed to provide credit support for the 
Obligations, and (ii) the Guarantor was not required to execute this 
Guaranty in violation of Section 202.7(d) of the ECOA.

22.  WAIVER OF JURY TRIAL.  THE GUARANTOR IRREVOCABLY WAIVES ANY AND ALL 
RIGHT THE GUARANTOR MAY HAVE TO A TRIAL BY JURY IN ANY ACTION, 
PROCEEDING OR CLAIM OF ANY NATURE RELATING TO THIS GUARANTY, ANY 
DOCUMENTS EXECUTED IN CONNECTION WITH THIS GUARANTY OR ANY TRANSACTION 
CONTEMPLATED IN ANY OF SUCH DOCUMENTS.  THE GUARANTOR ACKNOWLEDGES THAT 
THE FOREGOING WAIVER IS KNOWING AND VOLUNTARY.

The Guarantor acknowledges that it has read and understood all the 
provisions of this Guaranty, including the confession of judgment and 
waiver of jury trial, and has been advised by counsel as necessary or 
appropriate.


WITNESS the due execution hereof as a document under seal, as of the 
date first written above, with the intent to be legally bound hereby.


               [SEAL]                 II-VI DELAWARE, INCORPORATED


Attest:  /s/ Craig A. Creaturo        By:   /s/ Francis J. Kramer

Name:     Craig A. Creaturo           Name:  Francis J. Kramer 

Title:   Corporate Controller         Title:  President
         II-VI Incorporated 
















































Guaranty and Suretyship Agreement                                PNCBANK

THIS  GUARANTY  AND  SURETYSHIP  AGREEMENT (this "Guaranty") is made and 
entered into as of this 26th day of March, 1999,  by VLOC 
INCORPORATED.  (the "Guarantor"), with an address at 7826 Photonics 
Drive, New Port Richey, Florida, 34655 in consideration of the extension 
of credit by PNC BANK, NATIONAL ASSOCIATION (the "Bank"), with an 
address at One PNC Plaza, 249 Fifth Avenue, Pittsburgh, Pennsylvania 
15222-2707 to II-VI INCORPORATED, a Pennsylvania corporation with an 
address at 375 Saxonburg Blvd., Saxonburg, Pennsylvania 16056  (the 
"Borrower"), and other good and valuable consideration, the receipt and 
sufficiency of which are hereby acknowledged.

1.  Guaranty of Obligations.  The Guarantor hereby guarantees, and 
becomes surety for, the prompt payment and performance of all loans, 
advances, debts, liabilities, obligations, covenants and duties owing by 
the Borrower to the Bank or to any other direct or indirect subsidiary 
of PNC Bank Corp., of any kind or nature, present or future (including 
any interest accruing thereon after maturity, or after the filing of any 
petition in bankruptcy, or the commencement of any insolvency, 
reorganization or like proceeding relating to the Borrower, whether or 
not a claim for post-filing or post-petition interest is allowed in such 
proceeding), whether or not evidenced by any note, guaranty or other 
instrument, whether arising under any agreement, instrument or document, 
whether or not for the payment of money, whether arising by reason of an 
extension of credit, opening of a letter of credit, loan, equipment 
lease or guarantee, under any interest or currency swap, future, option 
or other interest rate protection or similar agreement, or in any other 
manner, whether arising out of overdrafts on deposit or other accounts 
or electronic funds transfers (whether through automated clearing houses 
or otherwise) or out of the Bank's non-receipt of or inability to 
collect funds or otherwise not being made whole in connection with 
depository transfer check or other similar arrangements, whether direct 
or indirect (including those acquired by assignment or participation), 
absolute or contingent, joint or several, due or to become due, now 
existing or hereafter arising, and any amendments, extensions, renewals 
or increases and all costs and expenses of the Bank incurred in the 
documentation, negotiation, modification, enforcement, collection or 
otherwise in connection with any of the foregoing, including reasonable 
attorneys' fees and expenses (hereinafter referred to collectively as 
the "Obligations").  If the Borrower defaults under any such 
Obligations, the Guarantor will pay the amount due to the Bank.

2.  Nature of Guaranty; Waivers.  This is a guaranty of payment and not 
of collection and the Bank shall not be required, as a condition of the 
Guarantor's liability, to make any demand upon or to pursue any of its 
rights against the Borrower, or to pursue any rights which may be 
available to it with respect to any other person who may be liable for 
the payment of the Obligations.  
This is an absolute, unconditional, irrevocable and continuing guaranty 
and will remain in full force and effect until all of the Obligations 
have been indefeasibly paid in full, and the Bank has terminated this 
Guaranty.  This Guaranty will remain in full force and effect even if 
there is no principal balance outstanding under the Obligations at a 
particular time or from time to time.  This Guaranty will not be 
affected by any surrender, exchange, acceptance, compromise or release 
by the Bank of any other party, or any other guaranty or any security 
held by it for any of the Obligations, by any failure of the Bank to 
take any steps to perfect or maintain its lien or security interest in 
or to preserve its rights to any security or other collateral for any of 
the Obligations or any guaranty, or by any irregularity, 
unenforceability or invalidity of any of the Obligations or any part 
thereof or any security or other guaranty thereof.  The Guarantor's 
obligations hereunder shall not be affected, modified or impaired by any 
counterclaim, set-off, deduction or defense based upon any claim the 
Guarantor may have against the Borrower or the Bank, except payment or 
performance of the Obligations.

Notice of acceptance of this Guaranty, notice of extensions of credit to 
the Borrower from time to time, notice of default, diligence, 
presentment, notice of dishonor, protest, demand for payment, and any 
defense based upon the Bank's failure to comply with the notice 
requirements of the applicable version of Uniform Commercial Code ss 9-
504 are hereby waived.  The Guarantor waives all defenses based on 
suretyship or impairment of collateral.

The Bank at any time and from time to time, without notice to or the 
consent of the Guarantor, and without impairing or releasing, 
discharging or modifying the Guarantor's liabilities hereunder, may (a) 
change the manner, place, time or terms of payment or performance of or 
interest rates on, or other terms relating to, any of the Obligations; 
(b) renew, substitute, modify, amend or alter, or grant consents or 
waivers relating to any of the Obligations, any other guaranties, or any 
security for any Obligations or guaranties; (c) apply any and all 
payments by whomever paid or however realized including any proceeds of 
any collateral, to any Obligations of the Borrower in such order, manner 
and amount as the Bank may determine in its sole discretion; (d) settle, 
compromise or deal with any other person, including the Borrower or the 
Guarantor, with respect to any Obligations in such manner as the Bank 
deems appropriate in its sole discretion; (e) substitute, exchange or 
release any security or guaranty; or (f) take such actions and exercise 
such remedies hereunder as provided herein.

3.  Repayments or Recovery from the Bank.  If any demand is made at any 
time upon the Bank for the repayment or recovery of any amount received 
by it in payment or on account of any of the Obligations and if the Bank 
repays all or any part of such amount by reason of any judgment, decree 
or order of any court or administrative body or by reason of any 
settlement or compromise of any such demand, the Guarantor will be and 
remain liable hereunder for the amount so repaid or recovered to the 
same extent as if such amount had never been received originally by the 
Bank.  The provisions of this section will be and remain effective 
notwithstanding any contrary action which may have been taken by the 
Guarantor in reliance upon such payment, and any such contrary action so 
taken will be without prejudice to the Bank's rights hereunder and will 
be deemed to have been conditioned upon such payment having become final 
and irrevocable.

4.    Financial Statements.  Unless compliance is waived in writing by 
the Bank or until all of the Obligations have been paid in full, the 
Guarantor will promptly submit to the Bank such information relating to 
the Guarantor's affairs (including but not limited to annual financial 
statements and tax returns for the Guarantor) or any security for the 
Guaranty as the Bank may reasonably request.

5.  Enforceability of Obligations.  No modification, limitation or 
discharge of the Obligations arising out of or by virtue of any 
bankruptcy, reorganization or similar proceeding for relief of debtors 
under federal or state law will affect, modify, limit or discharge the 
Guarantor's liability in any manner whatsoever and this Guaranty will 
remain and continue in full force and effect and will be enforceable 
against the Guarantor to the same extent and with the same force and 
effect as if any such proceeding had not been instituted.  The Guarantor 
waives all rights and benefits which might accrue to it by reason of any 
such proceeding and will be liable to the full extent hereunder, 
irrespective of any modification, limitation or discharge of the 
liability of the Borrower that may result from any such proceeding.

6.  Events of Default.  The occurrence of any of the following shall be 
an "Event of Default" hereunder:  (i) any Event of Default (as defined 
in any of the Obligations); (ii) any default under any of the 
Obligations that does not have a defined set of "Events of Default" and 
the lapse of any notice or cure period provided in such Obligations with 
respect to such default; (iii) demand by the Bank under any of the 
Obligations that have a demand feature; (iv) the Guarantor's failure to 
perform any of its obligations hereunder; (v) the falsity, inaccuracy or 
material breach by the Guarantor of any written warranty, representation 
or statement made or furnished to the Bank by or on behalf of the 
Guarantor; or (vi) the termination or attempted termination of this 
Guaranty.  Upon the occurrence of any Event of Default, (a) the 
Guarantor shall pay to the Bank the amount of the Obligations; or (b) on 
demand of the Bank, the Guarantor shall immediately deposit with the 
Bank, in U.S. dollars, all amounts due or to become due under the 
Obligations, and the Bank may at any time use such funds to repay the 
Obligations; or (c) the Bank in its discretion may exercise with respect 
to any collateral any one or more of the rights and remedies provided a 
secured party under the applicable version of the Uniform Commercial 
Code; or (d) the Bank in its discretion may exercise from time to time 
any other rights and remedies available to it at law, in equity or 
otherwise.

7.  Right of Setoff.  In addition to all liens upon and rights of setoff 
against the Guarantor's money, securities or other property given to the 
Bank by law, the Bank shall have, with respect to the Guarantor's 
obligations to the Bank under this Guaranty and to the extent permitted 
by law, a contractual possessory security interest in and a contractual 
right of setoff against, and the Guarantor hereby assigns, conveys, 
delivers, pledges and transfers to the Bank all of the Guarantor's 
right, title and interest in and to, all of the Guarantor's deposits, 
moneys, securities and other property now or hereafter in the possession 
of or on deposit with, or in transit to, the Bank or any other direct or 
indirect subsidiary of PNC Bank Corp., whether held in a general or 
special account or deposit, whether held jointly with someone else, or 
whether held for safekeeping or otherwise, excluding, however, all IRA, 
Keogh, and trust accounts.  Every such security interest and right of 
setoff may be exercised without demand upon or notice to the Guarantor.  
Every such right of setoff shall be deemed to have been exercised 
immediately upon the occurrence of an Event of Default hereunder without 
any action of the Bank, although the Bank may enter such setoff on its 
books and records at a later time.

8.  Collateral.   This Guaranty is secured by the property described in 
any collateral security documents which the Guarantor executes and 
delivers to the Bank and by such other collateral as previously may have 
been or may in the future be granted to the Bank to secure any 
obligations of the Guarantor to the Bank.

9.  Costs.  To the extent that the Bank incurs any costs or expenses in 
protecting or enforcing its rights under the Obligations or this 
Guaranty, including reasonable attorneys' fees and the costs and 
expenses of litigation, such costs and expenses will be due on demand, 
will be included in the Obligations and will bear interest from the 
incurring or payment thereof at the Default Rate (as defined in any of 
the Obligations).

10.  Postponement of Subrogation.  Until the Obligations are 
indefeasibly paid in full, the Guarantor postpones and subordinates in 
favor of the Bank any and all rights which the Guarantor may have to (a) 
assert any claim against the Borrower based on subrogation rights with 
respect to payments made hereunder, and (b) any realization on any 
property of the Borrower, including participation in any marshalling of 
the Borrower's assets. 

11.  Power to Confess Judgment.  The Guarantor hereby empowers any 
attorney of any court of record, after the occurrence of any Event of 
Default hereunder, to appear for the Guarantor and, with or without 
complaint filed, confess judgment, or a series of judgments, against the 
Guarantor in favor of the Bank for the amount of the Obligations and an 
attorney's commission of the greater of 10% of such principal and 
interest or $1,000 added as a reasonable attorney's fee, and for doing 
so, this Guaranty or a copy verified by affidavit shall be a sufficient 
warrant.  The Guarantor hereby forever waives and releases all errors in 
said proceedings and all rights of appeal and all relief from any and 
all appraisement, stay or exemption laws of any state now in force or 
hereafter enacted. 

No single exercise of the foregoing power to confess judgment, or a 
series of judgments, shall be deemed to exhaust the power, whether or 
not any such exercise shall be held by any court to be invalid, 
voidable, or void, but the power shall continue undiminished and it may 
be exercised from time to time as often as the Bank shall elect until 
such time as the Bank shall have received payment in full of the 
Obligations and costs.  Notwithstanding the attorney's  commission 
provided for in the preceding paragraph (which is included in the 
warrant for purposes of establishing a sum certain), the amount of 
attorneys' fees that the Bank may recover from the Guarantor shall not 
exceed the actual attorneys' fees incurred by the Bank.

12.  Notices.  All notices, demands, requests, consents, approvals and 
other communications required or permitted hereunder must be in writing 
and will be effective upon receipt.  Such notices and other 
communications may be hand-delivered, sent by facsimile transmission 
with confirmation of delivery and a copy sent by first-class mail, or 
sent by nationally recognized overnight courier service, to the 
addresses for the Bank and the Guarantor set forth above or to such 
other address as one may give to the other in writing for such purpose.

13.  Preservation of Rights.  No delay or omission on the Bank's part to 
exercise any right or power arising hereunder will impair any such right 
or power or be considered a waiver of any such right or power, nor will 
the Bank's action or inaction impair any such right or power.  The 
Bank's rights and remedies hereunder are cumulative and not exclusive of 
any other rights or remedies which the Bank may have under other 
agreements, at law or in equity.  The Bank may proceed in any order 
against the Borrower, the Guarantor or any other obligor of, or 
collateral securing, the Obligations.

14.  Illegality.  In case any one or more of the provisions contained in 
this Guaranty should be invalid, illegal or unenforceable in any 
respect, the validity, legality and enforceability of the remaining 
provisions contained herein shall not in any way be affected or impaired 
thereby.

15.  Changes in Writing.  No modification, amendment or waiver of any 
provision of this Guaranty nor consent to any departure by the Guarantor 
therefrom will be effective unless made in a writing signed by the Bank, 
and then such waiver or consent shall be effective only in the specific 
instance and for the purpose for which given.  No notice to or demand on 
the Guarantor in any case will entitle the Guarantor to any other or 
further notice or demand in the same, similar or other circumstance.

16.  Entire Agreement.  This Guaranty (including the documents and 
instruments referred to herein) constitutes the entire agreement and 
supersedes all other prior agreements and understandings, both written 
and oral, between the Guarantor and the Bank with respect to the subject 
matter hereof; provided, however, that this Guaranty is in addition to, 
and not in substitution for, any other guarantees from the Guarantor to 
the Bank.

17.  Successors and Assigns.  This Guaranty will be binding upon and 
inure to the benefit of the Guarantor and the Bank and their respective 
heirs, executors, administrators, successors and assigns; provided, 
however, that the Guarantor may not assign this Guaranty in whole or in 
part without the Bank's prior written consent and the Bank at any time 
may assign this Guaranty in whole or in part.

18.  Interpretation.  In this Guaranty, unless the Bank and the 
Guarantor otherwise agree in writing, the singular includes the plural 
and the plural the singular; references to statutes are to be construed 
as including all statutory provisions consolidating, amending or 
replacing the statute referred to; the word "or" shall be deemed to 
include "and/or", the words "including", "includes" and "include" shall 
be deemed to be followed by the words "without limitation"; and 
references to sections or exhibits are to those of this Guaranty unless 
otherwise indicated.  Section headings in this Guaranty are included for 
convenience of reference only and shall not constitute a part of this 
Guaranty for any other purpose.  If this Guaranty is executed by more 
than one party as Guarantor, the obligations of such persons or entities 
will be joint and several.

19.  Indemnity.  The Guarantor agrees to indemnify each of the Bank, its 
directors, officers and employees and each legal entity, if any, who 
controls the Bank (the "Indemnified Parties") and to hold each 
Indemnified Party harmless from and against any and all claims, damages, 
losses, liabilities and expenses (including all reasonable fees and 
charges of internal or external counsel with whom any Indemnified Party 
may consult and all expenses of litigation or preparation therefor) 
which any Indemnified Party may incur or which may be asserted against 
any Indemnified Party as a result of the execution of or performance 
under this Guaranty; provided, however, that the foregoing indemnity 
agreement shall not apply to claims, damages, losses, liabilities and 
expenses solely attributable to an Indemnified Party's gross negligence 
or willful misconduct.  The indemnity agreement contained in this 
Section shall survive the termination of this Guaranty.  The Guarantor 
may participate at its expense in the defense of any such claim.

20.  Governing Law and Jurisdiction.  This Guaranty has been delivered 
to and accepted by the Bank and will be deemed to be made in the State 
where the Bank's office indicated above is located.  THIS GUARANTY WILL 
BE INTERPRETED AND THE RIGHTS AND LIABILITIES OF THE BANK AND THE 
GUARANTOR DETERMINED IN ACCORDANCE WITH THE LAWS OF THE STATE WHERE THE 
BANK'S OFFICE INDICATED ABOVE IS LOCATED, EXCLUDING ITS CONFLICT OF LAWS 
RULES.  The Guarantor hereby irrevocably consents to the exclusive 
jurisdiction of any state or federal court in the county or judicial 
district where the Bank's office indicated above is located; provided 
that nothing contained in this Guaranty will prevent the Bank from 
bringing any action, enforcing any award or judgment or exercising any 
rights against the Guarantor individually, against any security or 
against any property of the Guarantor within any other county, state or 
other foreign or domestic jurisdiction.  The Guarantor acknowledges and 
agrees that the venue provided above is the most convenient forum for 
both the Bank and the Guarantor.  The Guarantor waives any objection to 
venue and any objection based on a more convenient forum in any action 
instituted under this Guaranty.

21.  Equal Credit Opportunity Act.  If the Guarantor is not an 
"applicant for credit" under Section 202.2 (e) of the Equal Credit 
Opportunity Act of 1974 ("ECOA"), the Guarantor acknowledges that (i) 
this Guaranty has been executed to provide credit support for the 
Obligations, and (ii) the Guarantor was not required to execute this 
Guaranty in violation of Section 202.7(d) of the ECOA.

22.  WAIVER OF JURY TRIAL.  THE GUARANTOR IRREVOCABLY WAIVES ANY AND ALL 
RIGHT THE GUARANTOR MAY HAVE TO A TRIAL BY JURY IN ANY ACTION, 
PROCEEDING OR CLAIM OF ANY NATURE RELATING TO THIS GUARANTY, ANY 
DOCUMENTS EXECUTED IN CONNECTION WITH THIS GUARANTY OR ANY TRANSACTION 
CONTEMPLATED IN ANY OF SUCH DOCUMENTS.  THE GUARANTOR ACKNOWLEDGES THAT 
THE FOREGOING WAIVER IS KNOWING AND VOLUNTARY.








The Guarantor acknowledges that it has read and understood all the 
provisions of this Guaranty, including the confession of judgment and 
waiver of jury trial, and has been advised by counsel as necessary or 
appropriate.


WITNESS the due execution hereof as a document under seal, as of the 
date first written above, with the intent to be legally bound hereby.

               [SEAL]                        VLOC INCORPORATED


Attest:  /s/ Craig A. Creaturo        By:   /s/ Francis J. Kramer

Name:     Craig A. Creaturo           Name:   Francis J. Kramer 

Title:   Corporate Controller         Title:  Vice President
         II-VI Incorporated 







































                  EXHIBIT "C" TO LETTER AGREEMENT

                     COMPLIANCE CERTIFICATE

      For the Fiscal Year Ended                  , 19    
                                -----------------    ----

      or

      For the Fiscal Quarter Ended _________________, 19___
                                   -----------------,   ---

Reference is hereby made to that certain Letter Agreement dated as of 
March 26th, 1999 (the Credit Agreement, together with all exhibits and 
schedules thereto and all extentions, renewals, amendments, 
substitutions and replacements thereof, is hereinafter referred to as 
the "Credit Agreement"), by and among II-VI INCORPORATED, a Pennsylvania 
corporation (the "Borrower"), and PNC BANK, NATIONAL ASSOCIATION (the 
"Bank").  All capitalized terms used herein as defined terms which are 
not defined herein but which are defined in the Credit Agreement shall 
have the same meanings herein as in the Credit Agreement.

This Compliance Certificate is being delivered to the Bank pursuant to 
Section 10 of the Credit Agreement simultaneously with the delivery of 
the annual or quarterly reports required by Section 10 of the Credit 
Agreement for the fiscal period referred to above.  The undersigned, the 
Chief Financial Officer of the Borrower, hereby certifies to the Bank, 
as follows:

1.    CHECK ONE:

- ----- The annual audited financial statements being delivered to the 
Bank with this Compliance Certificate are true, complete, and correct.

OR

- ----- The quarterly financial statements being delivered to the Bank 
with this Compliance Certificate are true, complete and correct and 
present fairly the financial position of the Borrower and the results of 
its operations and its cash flows for the Fiscal Quarter set for above 
in conformity with GAAP consistently applied (except that such financial 
statements may not contain all of the footnote disclosures required by 
GAAP).

2.    No Default or Event of Default exists on the date of this 
Compliance Certificate; no Default or Event of Default has occurred since
the date of the previously delivered Compliance Certificate; no Material 
Adverse Change has occurred since the date of the previously delivered 
Compliance Certificate; and no event has occurred since the date of the 
previously delivered Compliance Certificate which may result in a 
Material Adverse Change. 

[NOTE: If any Default, Event of Default, Material Adverse Change, or 
event which may result in a Material Adverse Change has occurred or is 
continuing, set forth on a seperate sheet the nature thereof and the 
action which the Borrower has taken, is taking or proposes to take with 
respect thereto.]

3.    The Borrower's compliance with the financial covenants set forth 
in Section 12 of the Credit Agreement is as follows:

a.    Net Worth.  As of                      [insert date of current 
                        -------------------
financial statements]:

(A)   The Borrower's Tangible Net Worth was                       
                                            --------------------- 

(B)   Fifty percent (50%) of the Borrower's consolidated net income (if 
positive) for the fiscal quarter ending                               was 
                                        ----------------------------
$                         .
 -------------------------

(C)  One hundred percent (100%) of the aggregate amount of net proceeds 
of each equity offering for the fiscal quarter ending 
                       equals $                            .
- ----------------------         -----------------------------

(D)  The sum of $41,000,000 plus the amount set forth in item (B) above 
plus the amount set forth in item (C) above equals 
$                      . 
 ----------------------

Under Section 12(a) of the Credit Agreement, the amount set forth in 
item (A) above is required to be greater than or equal to the amount set 
forth in item (D) above.  Therefore, the Borrower          [is/is not] 
                                                  --------
in compliance with Section       of the Credit Agreement.
                           -----

b.  Leverage Ratio.  As of                        [insert date of 
                           ----------------------
current financial statement]:

(A)   The Borrower's Total Indebtedness was $                       .
                                             -----------------------

(B)   The Borrower's EBITDA for the four (4) most recently completed 
fiscal quarters (taken as a single accounting period) was 
$                        , determined as follows:
 ------------------------

The Sum of:

(i)  The Borrower's consolidated net income for the four (4) most 
recently completed fiscal quarters taken as a single accounting period 
was $                         ;
     -------------------------

Excluding from consolidated net income:

(a)  The Borrower's extraordinary or non-recurring items of gain or 
loss (including those created by mandated changes in accounting 
treatment) for the Borrower for the four (4) most recently completed 
Fiscal quarters (taken as a single accounting period) were 
$                  ; and 
 ------------------

(b)  The Borrower's gains or losses accounted for on the equity method, 
except to the extent of cash distributions received, for the four (4) 
most recently completed fiscal quarters (taken as a single accounting 
period) were $                ; plus
              ----------------

(ii)  The Borrower's consolidated income tax expense for the four (4) 
most recently completed fiscal quarters (taken as a single accounting 
period) was $                    ; plus
             --------------------

(iii) The Borrower's consolidated interest expense for the four (4) most 
recently completed fiscal quarters (taken as a single accounting period) 
was $               ; plus
     ---------------

(iv)  The Borrower's consolidated depreciation and amortization expenses 
for the four (4) most recently completed fiscal quarters (taken as a 
single accounting period) were $                   ; and 
                                -------------------

(v)   Other consolidated non-cash expenses for the Borrower for the four 
(4) most recently completed fiscal quarters (taken as a single 
accounting period) were $                             .
                         -----------------------------

(C)   The ratio of the amount set forth in item (A) above to the amount 
calculated in item (B) above is         to 1.0.
                                -------

Under Section 12(b) of the Credit Agreement, the ratio set forth in item 
(C) above is required to be less than or equal to 2.5 to 1.0. Therefore, 
the Borrower [is/is not] in compliance with Section         of the 
                                                    -------
Credit Agreement.

c.   Interest Coverage Ratio.  As of                    [insert date of 
                                     ------------------
current financial statements]:

(A)  The Borrower's EBIT for the four (4) most recently completed 
fiscal quarters (taken as a single accounting period) was 
$                        .
 ------------------------

(B)  The Borrower's consolidated interest expense for the four (4) most 
recently completed fiscal quarters (taken as a single accounting period) 
was $                         .
     -------------------------



(C)  The ratio of the amount set forth in item (A) above to the amount 
set forth in item (B) above is      to      
                               ----    -----

Under Section 12(c) of the Credit Agremeemnt, the ratio set forth in 
item (C) above is required to be greater than or equal to 5.0 to 1.0. 
Therefore, the Borrower [is/is not] in compliance with Section        of 
                                                               ------
the Credit Agreement. 




IN WITNESS WHEREOF, the undersigned has duly executed this Compliance 
Certificate as said officer, for and on behalf of the Borrower, on the 
       day of             ,         .
- ------        ------------  --------

II-VI INCORPORATED


By:  
    -------------------------------

Name:  
      -----------------------------

Title: 
       -----------------------------



1 All pricing is expressed in basis points.  A basis point is equal to 
1/100 of 1%.







May 13, 1999

II-VI Incorporated 
375 Saxonburg Boulevard
Saxonburg, PA 16056

We have made a review, in accordance with standards established by the 
American Institute of Certified Public Accountants, of the unaudited 
interim financial information of II-VI Incorporated and Subsidiaries for 
the periods ended March 31, 1999 and 1998, as indicated in our report 
dated April 21, 1999; because we did not perform an audit, we expressed 
no opinion on that information.

We are aware that our report referred to above, which is included in 
your Quarterly Report on Form 10-Q for the quarter ended March 31, 1999, 
is incorporated by reference in Registration Statement No. 33-19511, No. 
33-38019, No. 33-19510, No. 33-63739, and No. 333-12737 on Form S-8 and 
Registration No. 333-04531 on Form S-3.

We also are aware that the aforementioned report, pursuant to Rule 
436(c) under the Securities Act of 1933, is not considered a part of the 
Registration Statement prepared or certified by an accountant or a 
report prepared or certified by an accountant within the meaning of 
Sections 7 and 11 of that Act.


/s/ Deloitte & Touche LLP
Pittsburgh, Pennsylvania


<TABLE> <S> <C>

<ARTICLE> 5
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   9-MOS
<FISCAL-YEAR-END>                          JUN-30-1999             JUN-30-1999
<PERIOD-START>                             JAN-01-1999             JUL-01-1998
<PERIOD-END>                               MAR-31-1999             MAR-31-1999
<CASH>                                           4,483                   4,483
<SECURITIES>                                         0                       0
<RECEIVABLES>                                   11,147                  11,147
<ALLOWANCES>                                       368                     368
<INVENTORY>                                      9,380                   9,380
<CURRENT-ASSETS>                                26,117                  26,117
<PP&E>                                          60,483                  60,483
<DEPRECIATION>                                  23,946                  23,946
<TOTAL-ASSETS>                                  67,644                  67,644
<CURRENT-LIABILITIES>                           10,885                  10,885
<BONDS>                                          2,568                   2,568
                                0                       0
                                          0                       0
<COMMON>                                        18,660                  18,660
<OTHER-SE>                                      33,280                  33,280
<TOTAL-LIABILITY-AND-EQUITY>                    67,644                  67,644
<SALES>                                         15,538                  44,541
<TOTAL-REVENUES>                                15,538                  44,541
<CGS>                                            8,938                  27,524
<TOTAL-COSTS>                                    8,938                  27,524
<OTHER-EXPENSES>                                 4,316                  11,631
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                  61                     341
<INCOME-PRETAX>                                  2,223                   5,045
<INCOME-TAX>                                       725                   1,616
<INCOME-CONTINUING>                              1,498                   3,429
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                     1,498                   3,429
<EPS-PRIMARY>                                     0.24                    0.54
<EPS-DILUTED>                                     0.23                    0.53
        

</TABLE>


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