PORTEC INC
SC 13D/A, 1997-01-09
CONSTRUCTION MACHINERY & EQUIP
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         THIS PAPER DOCUMENT IS BEING SUBMITTED PURSUANT
                TO RULE 902(g) OF REGULATION S-T


               SECURITIES AND EXCHANGE COMMISSION
                     Washington, D.C.  20549
                                
                                                
                          SCHEDULE 13D
(Amendment No. 6)

                               
Under the Securities Exchange Act of 1934
  
     Portec, Inc.    
(Name of Issuer)

                        
     Common Stock Par Value $1.00 Per Share     
(Title of Class and Securities) 

                                
       736202102         
(CUSIP Number of Class of Securities)
                                
                               
                               
  James E. McKee, Gabelli Funds, Inc.,
One Corporate Center, Rye, NY 10580-1434 (914) 921-5294
(Name, Address and Telephone Number of Person Authorized
to Receive Notices and Communications)

                                
                     January 6, 1997                     
(Date of Event Which Requires Filing of this Statement)


If the filing person has previously filed a statement on Schedule
13G to report the acquisition which is the subject of this State-
ment because of Rule 13d-1(b)(3) or (4), check the following box: 
                                                          ____    

                                                       /___/ 

Check the following box if a fee is being paid with this State-
ment:
                                                     _____
                                                      /    /
<PAGE>
________________________________________________________________

CUSIP No. 736202102                                        13D
_________________________________________________________________
(1)  NAMES OF REPORTING PERSONS 
      S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS
      GAMCO Investors, Inc.              I.D. No. 13-2951242
_________________________________________________________________
(2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:
                                                       ____
                                                  (a) /___/
                                                       ____
                                                  (b) /___/
_________________________________________________________________
(3)  SEC USE ONLY
_________________________________________________________________
(4)  SOURCE OF FUNDS*
      OO:  Funds of investment advisory clients
_________________________________________________________________
(5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
     REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)          _____
                                                     /  x /
_________________________________________________________________
(6)  CITIZENSHIP OR PLACE OF ORGANIZATION
      New York
_________________________________________________________________ 
                                        : (7) SOLE VOTING POWER
                                        :     310,880 (Item 5)
                                        :________________________
                                        : (8) SHARED VOTING POWER
 NUMBER OF SHARES BENEFICIALLY          :     None
 OWNED BY EACH REPORTING                :________________________ 
 PERSON WITH                            : (9) SOLE DISPOSITIVE 
                                        :     POWER
                                        :     353,380 (Item 5)
                                        :________________________ 
                                        :(10) SHARED DISPOSITIVE 
                                        :     POWER
                                        :     None  
_________________________________________________________________
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      353,380 (Item 5)
_________________________________________________________________

(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11
     EXCLUDES CERTAIN SHARES*                         ____
                                                     /___/
_________________________________________________________________
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
      8.15%
_________________________________________________________________
(14) TYPE OF REPORTING PERSON*
      IA, CO
_________________________________________________________________
              *SEE INSTRUCTIONS BEFORE FILLING OUT!   
_________________________________________________________________
CUSIP No. 736202102                                        13D
_________________________________________________________________
(1)  NAMES OF REPORTING PERSONS 
      S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS
      Gabelli International II Limited  I.D. No. Foreign         
      Corporation
_________________________________________________________________
(2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:
                                                       ____
                                                  (a) /___/
                                                       ____
                                                  (b) /___/
_________________________________________________________________
(3)  SEC USE ONLY
_________________________________________________________________
(4)  SOURCE OF FUNDS*
      None
_________________________________________________________________
(5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
     REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)          ____
                                                     /___/
_________________________________________________________________
(6)  CITIZENSHIP OR PLACE OF ORGANIZATION
      British Virgin Islands
_________________________________________________________________ 
                                        : (7) SOLE VOTING POWER
                                        :     None (Item 5)
                                        :________________________
                                        : (8) SHARED VOTING POWER
 NUMBER OF SHARES BENEFICIALLY          :     None  
 OWNED BY EACH REPORTING                :________________________ 
 PERSON WITH                            : (9) SOLE DISPOSITIVE 
                                        :     POWER
                                        :     None  (Item 5)
                                        :________________________ 
                                        :(10) SHARED DISPOSITIVE 
                                        :     POWER
                                        :     None  
_________________________________________________________________
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      None (Item 5)
_________________________________________________________________
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11
     EXCLUDES CERTAIN SHARES*                         ____
                                                     /___/
_________________________________________________________________
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
      0.00%
_________________________________________________________________
(14) TYPE OF REPORTING PERSON*
      CO
_________________________________________________________________

              *SEE INSTRUCTIONS BEFORE FILLING OUT!
________________________________________________________________

CUSIP No. 736202102                                        13D
_________________________________________________________________
(1)  NAMES OF REPORTING PERSONS 
      S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS
      Gabelli Performance Partnership L.P.  I.D. No. 13-3396569
_________________________________________________________________
(2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:
                                                       ____
                                                  (a) /___/
                                                       ____
                                                  (b) /___/
_________________________________________________________________
(3)  SEC USE ONLY
_________________________________________________________________
(4)  SOURCE OF FUNDS*
     WC 
_________________________________________________________________
(5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
     REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)          ____
                                                     /___/
_________________________________________________________________
(6)  CITIZENSHIP OR PLACE OF ORGANIZATION
      Delaware 
_________________________________________________________________ 
                                        : (7) SOLE VOTING POWER
                                        :     34,600 (Item 5)
                                        :________________________
                                        : (8) SHARED VOTING POWER
 NUMBER OF SHARES BENEFICIALLY          :     None  
 OWNED BY EACH REPORTING                :________________________ 
 PERSON WITH                            : (9) SOLE DISPOSITIVE 
                                        :     POWER
                                        :     34,600 (Item 5)
                                        :________________________ 
                                        :(10) SHARED DISPOSITIVE 
                                        :     POWER
                                        :     None  
_________________________________________________________________
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      34,600 (Item 5)
_________________________________________________________________
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11
     EXCLUDES CERTAIN SHARES*                         ____
                                                     /___/
_________________________________________________________________
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
      0.80%
_________________________________________________________________
(14) TYPE OF REPORTING PERSON*
      PN
_________________________________________________________________

              *SEE INSTRUCTIONS BEFORE FILLING OUT!
_________________________________________________________________

CUSIP No. 736202102                                        13D
_________________________________________________________________
(1)  NAMES OF REPORTING PERSONS 
      S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS
      Gabelli International Limited I.D. No. Foreign   
                                        Corporation
_________________________________________________________________
(2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:
                                                       ____
                                                  (a) /___/
                                                       ____
                                                  (b) /___/
_________________________________________________________________
(3)  SEC USE ONLY
_________________________________________________________________
(4)  SOURCE OF FUNDS*
      WC 
_________________________________________________________________
(5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
     REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)          ____
                                                     /___/
_________________________________________________________________
(6)  CITIZENSHIP OR PLACE OF ORGANIZATION
      British Virgin Islands
_________________________________________________________________ 
                                        : (7) SOLE VOTING POWER
                                        :     71,000 (Item 5)
                                        :________________________
                                        : (8) SHARED VOTING POWER
 NUMBER OF SHARES BENEFICIALLY          :     None  
 OWNED BY EACH REPORTING                :________________________ 
 PERSON WITH                            : (9) SOLE DISPOSITIVE 
                                        :     POWER
                                        :     71,000 (Item 5)
                                        :________________________ 
                                        :(10) SHARED DISPOSITIVE 
                                        :     POWER
                                        :     None  
_________________________________________________________________
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      71,000 (Item 5)
_________________________________________________________________
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11
     EXCLUDES CERTAIN SHARES*                         ____
                                                     /___/
_________________________________________________________________
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
      1.64%
_________________________________________________________________
(14) TYPE OF REPORTING PERSON*
      CO
_________________________________________________________________

              *SEE INSTRUCTIONS BEFORE FILLING OUT!
_________________________________________________________________

CUSIP No. 736202102                                        13D
_________________________________________________________________
(1)  NAMES OF REPORTING PERSONS 
     S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS
     Mario J. Gabelli                  I.D. No. ###-##-####
_________________________________________________________________ 
(2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:
                                                       ____
                                                  (a) /___/
                                                       ____
                                                  (b) /___/
_________________________________________________________________
(3)  SEC USE ONLY
_________________________________________________________________
(4)  SOURCE OF FUNDS*
      None 
_________________________________________________________________
(5)  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
     REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)          ____
                                                     /   /
_________________________________________________________________
(6)  CITIZENSHIP OR PLACE OF ORGANIZATION
      USA 
_________________________________________________________________ 
                                        : (7) SOLE VOTING POWER
                                        :     None (Item 5)
                                        :________________________
                                        : (8) SHARED VOTING POWER
 NUMBER OF SHARES BENEFICIALLY          :     None  
 OWNED BY EACH REPORTING                :________________________ 
 PERSON WITH                            : (9) SOLE DISPOSITIVE 
                                        :     POWER
                                        :     None (Item 5)
                                        :________________________ 
                                        :(10) SHARED DISPOSITIVE 
                                        :     POWER
                                        :     None  
_________________________________________________________________
(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
     None (Item 5)
_________________________________________________________________
(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11
     EXCLUDES CERTAIN SHARES*                         _____
                                                     /  x /
_________________________________________________________________
(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
      0.00%
_________________________________________________________________
(14) TYPE OF REPORTING PERSON*
      IN
_________________________________________________________________

              *SEE INSTRUCTIONS BEFORE FILLING OUT!
Item 1.   Security and Issuer
          The class of equity securities to which this statement on
Schedule 13D relates to is the Common Stock, par value $1.00 per
share ("Securities"), of Portec, Inc. (the "Issuer"), a Delaware
Corporation, with principal offices located at 122 West 22nd St.
Suite 100, Oakbrook, IL  60521.  This Amendment No. 6 to Schedule
13D is being filed on behalf of the undersigned to amend the
Schedule 13D, as amended (the "Schedule 13D") which was originally
filed on April 1, 1994.  

Item 2.   Identity and Background
          This statement is being filed by Mario J. Gabelli ("Mr.
Gabelli") and various entities which he directly or indirectly
controls or for which he acts as chief investment officer.  These
entities, except for Lynch Corporation ("Lynch"), Spinnaker
Industries, Incorporated ("Spinnaker"), Western New Mexico
Telephone Company ("Western New Mexico"), Entoleter, Inc. ("Entole-
ter"),  Lynch Telecommunications Corporation ("Lynch Telecom"),
Lynch Telephone Corporation ("Lynch Telephone") and Inter-Community
Telephone Company ("Inter-Community") (collectively, "Lynch and its
affiliates"), engage in various aspects of the securities business,
primarily as investment adviser to various institutional and
individual clients, including registered investment companies and
pension plans, as broker/dealer and as general partner of various
private investment partnerships.  Certain of these entities may
also make investments for their own accounts. 
          The foregoing persons in the aggregate often own benefi-
cially more than 5% of a class of equity securities of a particular
issuer.  Although several of the foregoing persons are treated as
institutional investors for purposes of reporting their beneficial
ownership on the short-form Schedule 13G, the holdings of those who
do not qualify as institutional investors may exceed the 1%
threshold presented for filing on Schedule 13D or implementation of
their investment philosophy may from time to time require action
which could be viewed as not completely passive.  In order to avoid
any question as to whether their beneficial ownership is being
reported on the proper form and in order to provide greater
investment flexibility and administrative uniformity, these persons
have decided to file their beneficial ownership reports on the more
detailed Schedule 13D form rather than on the short-form Schedule
13G and thereby to provide more expansive disclosure than may be
necessary. 
          (a), (b) and (c) - This statement is being filed by one
or more of the following persons: Gabelli Funds, Inc. ("GFI"),
GAMCO Investors, Inc. ("GAMCO"), Gabelli Securities, Inc. ("GSI"),
Gabelli & Company, Inc. ("Gabelli & Company"), Gabelli Performance
Partnership L.P. ("GPP"), GLI, Inc. ("GLI"), Gabelli Associates
Fund ("Gabelli Associates"), Gabelli Associates Limited ("GAL"),
Gabelli & Company, Inc. Profit Sharing Plan (the "Plan"), Gabelli
International Limited ("GIL"), Gabelli International II Limited
("GIL II"), Gabelli International Gold Fund Limited ("GIGFL"), ALCE
Partners, L.P. ("ALCE"), Gabelli Multimedia Partners, L.P.
("Multimedia Partners"), Gabelli Asset Management Company Interna-
tional Advisory Services Ltd. ("GIASL"), Mr. Gabelli, Lynch,
Spinnaker, Western New Mexico, Entoleter, Lynch Telecom, Lynch
Telephone and Inter-Community. Those of the foregoing persons
signing this Schedule 13D are hereafter referred to as the
"Reporting Persons".     
          GAMCO, a wholly-owned subsidiary of GFI, is an investment
adviser registered under the Investment Advisers Act of 1940, as
amended ("Advisers Act").  GAMCO is an investment manager providing
discretionary managed account services in the equity area for
employee benefit plans, private investors, endowments and founda-
tions. 
          Gabelli & Company, a wholly-owned subsidiary of GSI, is
a broker-dealer registered under the Securities Exchange Act of
1934, as amended ("l934 Act"), which as a part of its business
regularly purchases and sells securities for its own account.  
          GLI, a wholly-owned subsidiary of GSI, is the trustee for
the Gabelli-Rosenthal & Partners, L.P. Liquidating Trust.
          Gabelli Associates is a New York limited partnership
whose primary business purpose is risk arbitrage investments.  GSI
and Mr. Gabelli are the general partners of Gabelli Associates. 
          GAL is a corporation whose primary business purpose is
risk arbitrage investments.  Shares of GAL's Common Stock will be
offered to persons who are neither citizens nor residents of the
United States and may be offered to a limited number of U.S.
investors.  GSI is the investment manager of GAL.
          GSI, a majority-owned subsidiary of GFI, is a Delaware
corporation which as a part of its business regularly purchases and
sells securities for its own account.  It is the immediate parent
of Gabelli & Company.  
          GFI is the ultimate parent company for a variety of
companies engaged in the securities business, each of which is
named above.  In addition, GFI is an investment adviser registered
under the Advisers Act.  GFI is an investment adviser which
presently provides discretionary managed account services for The
Gabelli Equity Trust Inc., The Gabelli Asset Fund, The Gabelli
Growth Fund, The Gabelli Convertible Securities Fund, Inc., The
Gabelli Value Fund Inc., The Gabelli Small Cap Growth Fund, The
Gabelli Equity Income Fund, The Gabelli ABC Fund, The Gabelli
Global Telecommunications Fund, Gabelli Gold Fund, Inc., The
Gabelli Global Multimedia Trust Inc., The Gabelli Global Convert-
ible Securities Fund, Gabelli Capital Asset Fund, Gabelli Interna-
tional Growth Fund, Inc. and The Gabelli Global Interactive Couch
Potato Fund (collectively, the "Funds"), which are registered
investment companies.
          The Plan, a qualified employee profit sharing plan,
covers substantially all employees of GFI and its affiliates. 
          GPP, a Delaware limited partnership, is a limited
partnership whose primary business purpose is investing in
securities.  Mr. Gabelli is the general partner and chief invest-
ment officer of GPP. 
          GIL is a corporation whose primary business purpose is
investing in a portfolio of equity securities and securities
convertible into, or exchangeable for, equity securities in order
to achieve its investment objective of significant long-term growth
of capital.  Shares of GIL's common stock are offered to persons
who are neither citizens nor residents of the United States and may
be offered to a limited number of U.S. investors.  The investments
of GIL are managed by Mr. Gabelli who is also a director and
Chairman of the Board of Directors of GIL.
          GIL II is a corporation whose business purpose is
investing primarily in a portfolio of equity securities and
securities convertible into, or exchangeable for, equity securities
in order to achieve its investment objective of significant
long-term growth of capital.  Shares of GIL II's common stock are
offered to persons who are neither citizens nor residents of the
United States and may be offered to a limited number of U.S.
investors.  The investments of GIL II are managed by Mr. Gabelli
who is also a director and Chairman of the Board of Directors of
GIL II.
       ALCE is a Delaware investment limited partnership that seeks
long-term capital appreciation primarily through investments in
public and private equity securities.  GSI is a general partner of
ALCE.
       Multimedia Partners is a Delaware investment limited
partnership whose objective is to provide long-term capital
appreciation by investing primarily in public and private multime-
dia communications companies.  GSI is a general partner of
Multimedia Partners.
       GIASL is a corporation whose primary business purpose is to
provide advisory services to offshore funds.
       Lynch, an Indiana corporation, is a diversified public
company traded on the American Stock Exchange.  Its subsidiaries
are engaged in communications, services, and manufactured products. 
Spinnaker, a Delaware subsidiary of Lynch, is also a public company
and its stock is traded through the NASDAQ System.  Spinnaker is a
diversified manufacturing firm with major subsidiaries in specialty
adhesive-backed materials business.  Another of Lynch's subsidiar-
ies, Western New Mexico, provides telephone services in a service
area in Southwestern New Mexico.  Inter-Community, which is also a
subsidiary of Lynch, provides local telephone services in an area
40 miles west of Fargo, North Dakota.   Lynch and Spinnaker
actively pursue new business ventures and acquisitions.  Lynch and
its affiliates make investments in marketable securities to
preserve capital and maintain liquidity for financing their
business activities and acquisitions (not in the case of Western
New Mexico) and are not engaged in the business of investing,
reinvesting, or trading in securities.  Mr. Gabelli is Chairman of
Lynch and owns beneficially 23.52% of the shares of common stock of
Lynch. 
          Mr. Gabelli is the majority stockholder and Chairman of
the Board of Directors and Chief Executive Officer of GFI and the
Chief Investment Officer for each of the Reporting Persons.  GFI,
in turn, is the majority stockholder of GAMCO.  GFI is also the
majority stockholder of GSI.  Gabelli & Company is a wholly-owned
subsidiary of GSI.  GLI is a wholly-owned subsidiary of GSI.
          The Reporting Persons do not admit that they constitute
a group. 
          GFI, GAMCO, Gabelli & Company and GLI are New York
corporations and GSI is a Delaware corporation, each having its
principal business office at One Corporate Center, Rye, New York
10580-1434. GPP is a Delaware limited partnership having its
principal business office at 8 Sound Shore Drive, Greenwich,
Connecticut 06830.  Gabelli Associates is a New York limited
partnership having its principal business office at One Corporate
Center, Rye, New York 10580-1434. GAL and GIL are corporations
organized under the laws of the British Virgin Islands having their
principal business office at c/o MeesPierson (Cayman) Limited,
British American Centre, Dr. Roy's Drive-Phase 3, George Town,
Grand Cayman, British West Indies.  GIL II is a corporation
organized under the laws of the British Virgin Islands having their
principal business office at c/o Coutts & Company (Cayman) Limited,
West Bay Road, Grand Cayman, British West Indies.  GIASL is a
Bermuda corporation with its principal business office at c/o
Appleby, Spurling & Kempe, Cedar House, 41 Cedar Avenue, Hamilton
HM12, Bermuda.  Lynch is an Indiana corporation having its
principal business office at 8 Sound Shore Drive, Greenwich, CT
06830.  Spinnaker is a Delaware corporation having its principal
business office at 251 Welton Street, Hamden, CT 06511. 
          For information required by instruction C to Schedule 13D
with respect to the executive officers and directors of the
foregoing entities and other related persons (collectively,
"Covered Persons"), reference is made to Schedule I annexed hereto
and incorporated herein by reference. 
          (d) and (e) -  On December 8, 1994, the SEC instituted
and simultaneously accepted offers for the settlement of an
administrative proceeding against Gabelli & Company and GAMCO.  The
order instituting the proceeding included a finding, which Gabelli
& Company and GAMCO neither admitted nor denied, that they failed
to implement and maintain policies and procedures reasonably
designed to prevent the misuse of material, nonpublic information
by not sepecifically addressing the special circumstances that
arose from their affiliation with Lynch Corporation, a public
company.  To resolve this matter, Gabelli & Company and GAMCO
agreed to cease and desist from violating Section 15(f) of the 1934
Act and Section 204A of the Advisers Act, respectively.  They
further agreed to each pay a civil penalty in the amount of
$50,000, and to retain, and adopt the recommendations of, an
independant consultant regarding their Section 15(f) and Section
204A policies and procedures.  
     (f) - Reference is made to Schedule I hereto. 

Item 3.   Source and Amount of Funds or Other Consideration
               All Reporting Persons used an aggregate of approxi-
mately $5,366,225 to purchase the Securities reported as benefi-
cially owned in Item 5 below.  GAMCO used approximately $4,293,567
of funds that were provided through the accounts of certain of its
investment advisory clients (and, in some cases of some such
accounts at GAMCO, may be through borrowings from client margin
accounts) in order to purchase the Securities for such clients. 
GIL used approximately $725,620, respectively, of working capital
to purchase the Securities reported by it.  GPP used approximately
$347,038 of the investment funds of the partnership to purchase the
Securities reported by it.

Item 4.   Purpose of Transaction
          Each of the Reporting Persons, with the exceptions of
Lynch and its affiliates, has purchased and holds the Securities
reported by it for investment for one or more accounts over which
it has shared, sole, or both investment and/or voting power, for
its own account, or both. 
          The Reporting Persons, with the exceptions of Lynch and
its affiliates, are engaged in the business of securities analysis
and investment and pursue an investment philosophy of identifying
undervalued situations.  In pursuing this investment philosophy,
the Reporting Persons analyze the operations, capital structure and
markets of companies in which they invest, including the Issuer, on
a continuous basis through analysis of documentation and discus-
sions with knowledgeable industry and market observers and with
representatives of such companies (often at the invitation of
management). The Reporting Persons do not believe they possess
material inside information concerning the Issuer.  As a result of
these analytical activities one or more of the Reporting Persons
may issue analysts reports, participate in interviews or hold
discussions with third parties or with management in which the
Reporting Person may suggest or take a position with respect to
potential changes in the operations, management or capital
structure of such companies as a means of enhancing shareholder
values. Such suggestions or positions may relate to one or more of
the transactions specified in clauses (a) through (j) of Item 4 of
the Schedule 13D form, including, without limitation, such matters
as disposing of one or more businesses, selling the company or
acquiring another company or business, changing operating or
marketing strategies, adopting or not adopting, certain types of
anti-takeover measures and restructuring the company's capitaliza-
tion or dividend policy. 
          Each of the Reporting Persons intends to adhere to the
foregoing investment philosophy with respect to the Issuer.  How-
ever, none of the Reporting Persons intends to seek control of the
Issuer or participate in the management of the Issuer, and any
Reporting Person that is registered as an investment company under
the l940 Act will participate in such a transaction only following
receipt of an exemption from the SEC under Rule l7D-l under the
l940 Act, if required, and in accordance with other applicable law.
In pursuing this investment philosophy, each Reporting Person will
continuously assess the Issuer's business, financial condition,
results of operations and prospects, general economic conditions,
the securities markets in general and those for the Issuer's
securities in particular, other developments and other investment
opportunities, as well as the investment objectives and diversifi-
cation requirements of its shareholders or clients and its
fiduciary duties to such shareholders or clients.  Depending on
such assessments, one or more of the Reporting Persons may acquire
additional Securities or may determine to sell or otherwise dispose
of all or some of its holdings of Securities.  Although the
Reporting Persons share the same basic investment philosophy and
although portfolio decisions are made by or under the supervision
of Mr. Gabelli, the investment objectives and diversification
requirements of various clients differ from those of other clients
so that one or more Reporting Persons may be acquiring Securities
while others are disposing of Securities.
          With respect to voting of the Securities, the Reporting
Persons have adopted general voting policies relating to voting on
specified issues affecting corporate governance and shareholder
values.  Under these policies, the Reporting Persons generally vote
all securities over which they have voting power in favor of
cumulative voting, financially reasonable golden parachutes, one
share one vote, management cash incentives and pre-emptive rights
and against greenmail, poison pills, supermajority voting, blank
check preferred stock and super-dilutive stock options.  Exceptions
may be made when management otherwise demonstrates superior sen-
sitivity to the needs of shareholders.  In the event that the
aggregate voting position of all joint filers shall exceed 25% of
the total voting position of the issuer then the proxy voting
committees of each of the Funds shall vote their Fund's shares
independently.
          Each of the Covered Persons who is not a Reporting Person
has purchased the Securities reported herein as beneficially owned
by him for investment for his own account or that of one or more
members of his immediate family. Each such person may acquire
additional Securities or dispose of some or all of the Securities
reported herein with respect to him. 
          Other than as described above, none of the Reporting
Persons and none of the Covered Persons who is not a Reporting
Person has any present plans or proposals which relate to or would
result in any transaction, change or event specified in clauses (a)
through (j) of Item 4 of the Schedule 13D.  

Item 5.   Interest In Securities Of The Issuer
               (a)  The aggregate number and percentage of
Securities to which this Schedule 13D relates is 458,980 shares,
representing 10.59% of the 4,335,596 shares outstanding as reported
in the Issuer's most recently filed Form 10-Q for the quarter ended
September 30, 1996.  The Reporting Persons beneficially own those
Securities as follows: 
                              Shares of           % of
                              Common              Class of
Name                          Stock               Common  

GAMCO
  As Principal                       0                0.00%
  As Agent                     353,380                8.15%

GIL                             72,000                1.64%
                                      
GIL II                               0                0.00%

Mario J. Gabelli                     0                0.00%

GPP                             61,600                1.44%

          Mr. Gabelli is deemed to have beneficial ownership of
the Securities beneficially owned by each of the foregoing
persons and GFI is deemed to have beneficial ownership of the
securities owned beneficially by each of the foregoing persons
other than Mr. Gabelli. 
          (b) Each of the Reporting Persons and Covered Persons
has the sole power to vote or direct the vote and sole power to
dispose or to direct the disposition of the Securities reported
for it, either for its own benefit or for the benefit of its
investment clients or its partners, as the case may be, except
that GAMCO does not have authority to vote 42,500 of the reported
shares, and except that the power of Mr. Gabelli and GFI is
indirect with respect to Securities beneficially owned directly
by other Reporting Persons. 
          (c) Information with respect to all transactions in the
Securities which were effected during the past sixty days by each
of the Reporting Persons and Covered Persons is set forth on
Schedule II annexed hereto and incorporated herein by reference.


Item 6.   Contracts, Arrangements, Understandings or 
          Relationships with Respect to Securities of the Issuer

          The powers of disposition and voting of GFI and GAMCO
with respect to Securities owned beneficially by them on behalf of
their investment advisory clients, of GLI, Mr. Gabelli and GSI with
respect to Securities owned beneficially by them on behalf of the
partnerships which they directly or indirectly manage, and of GIL
and GAL with respect to Securities owned beneficially by them on
behalf of their shareholders, are held pursuant to written
agreements with such clients and partnerships.  The pertinent
portions of forms of such agreements utilized by such Reporting
Persons are filed as Exhibits hereto. <PAGE>
Item 7.Material to be Filed as an Exhibit

          The following Exhibits B, D, E and F are incorporated
herein by reference to Exhibits B, D, E and F in Schedule 13D of
various Gabelli entities dated June 19, l989 relating to the Common
Stock of Lincoln Telecommunications Company.  The following Exhibit
K is incorporated by reference to Exhibit K in Amendment No. 3 to
Schedule 13D of various Gabelli entities dated January 3, 1989
relating to the Common Stock of Wynn's International.  The
following Exhibit N is incorporated by reference to Exhibit N to
Schedule 13D of various Gabelli entities dated October 9, 1989
relating to the Common Stock of Graphic Technology, Inc.  The
following Exhibit BB is incorporated by reference to Exhibit BB in
Amendment No. 6 to Schedule 13D of various Gabelli entities dated
November 3, 1992 relating to the Common Stock of Hector Communica-
tions. The following Exhibit CC is incorporated by reference to
Exhibit CC in Amendment No. 10 to Schedule 13D of various Gabelli
entities dated November 9, 1992 relating to the Common Stock of The
Liberty Corporation.  The following Exhibit LL is incorporated by
reference to Exhibit LL in the initial Schedule 13D of various
Gabelli entities dated June 27, 1995 relating to the Common Stock
of Pulitzer Publishing.  The following Exhibit RR is incorporated
by reference to Exhibit RR in Amendement No. 16 to Schedule 13D of
various Gabelli entities dated April 23, 1996 relating to the
Common Stock of Aaron Rents, Inc.
   
          Exhibit A:     Joint Filing Agreement 
          Exhibit B:     Pertinent portions of form of investment
                         advisory agreement used by GAMCO Inves-
                         tors, Inc.

          Exhibit D:     Pertinent portions of Gabelli Funds, Inc.
                         advisory agreements.

          Exhibit E:     Pertinent portions of Gabelli Asset Fund
                         and Gabelli Growth Fund voting procedu-
                         res.

          Exhibit F:     Pertinent portions of partnership agree-
                         ments to which Gabelli Associates, GLI
                         and GPP are parties.

          Exhibit K:     Pertinent portions of the Investment
                         Management Agreement of GIL.

          Exhibit N:     Pertinent portions of the Investment
                         Management Agreement of GAL.

          Exhibit BB:    Memorandum of understanding between      
                         Gabelli Funds, Inc., Mario J. Gabelli    
                         and the Federal Communications Commission
                         (dated November 3, 1992).

          Exhibit CC:    Joint motion for approval of memorandm
                         of understanding file with FCC by        
                         Gabelli Funds, Inc., Mario J. Gabelli    
                         and the Federal Communications Commis-
                         sion (dated November 9, 1992).

          Exhibit LL:    Powers of Attorney to Stephen G. Bondi, 
                         Steven M. Joenk, and James E. McKee from
                         Joseph H. Epel.

                         Powers of Attorney to Stephen G. Bondi, 
                         Steven M. Joenk, and James E. McKee from
                         Robert E. Dolan. 

                         Powers of Attorney to Stephen G. Bondi, 
                         Steven M. Joenk, and James E. McKee from
                         Mario J. Gabelli.

          Exhibit RR:    Powers of Attorney to Stephen G. Bondi,
                         Steven M. Joenk, and James E. McKee from 
                         Marc J. Gabelli.











Signature      
After reasonable inquiry and to the best of my knowledge and
belief, I certify that the information set forth in this statement
is true, complete and correct. 
Dated:    January 9, 1997
                                   MARIO J. GABELLI                    
                            

                                   By:________________________
                                      James E. McKee                
                                      Attorney-in-fact

                          
                                   GAMCO INVESTORS, INC.  
                                   

                                   By:_________________________
                                      Douglas R. Jamieson      
                                      Executive Vice President
                                 

                                   GABELLI INTERNATIONAL LIMITED II
                                   

                                   By:_________________________
                                      Mario J. Gabelli, Chairman
                                      and Investment Manager
                                      by: James E. McKee               
                                          Attorney-in-Fact
                                       

                                   GABELLI INTERNATIONAL LIMITED
                                

                                   By:__________________________
                                      Mario J. Gabelli, Chairman
                                      and Investment Manager
                                      by: James E. McKee       
                                          Attorney-in-Fact



                                   GABELLI PERFORMANCE PARTNERSHIP
                                   

                                   By:___________________________
                                      Mario J. Gabelli, Chairman
                                      and Investment Manager
                                      by: James E. McKee
                                          Attorney-in-Fact
                                                                 
                                                       
                                                       Schedule I


              Information with Respect to Executive
            Officers and Directors of the Undersigned 

          Schedule I to Schedule 13D is amended, in pertinent 

part, as follows:


          The following sets forth as to each of the executive
officers and directors of the undersigned: his name; his business
address; and his present principal occupation or employment and
the name, principal business and address of any corporation or
other organization in which such employment is conducted.  Unless
otherwise specified, the principal employer of each such in-
dividual is Gabelli Funds, Inc., Gabelli & Company, Inc., or
GAMCO Investors, Inc., the business address of each of which is
One Corporate Center, Rye, New York 10580, and each such
individual identified below is a citizen of the United States. 
To the knowledge of the undersigned, during the last five years,
no such person has been convicted in a criminal proceeding
(excluding traffic violations or similar misdemeanors), and no
such person was a party to a civil proceeding of a judicial or
administrative body of competent jurisdiction as a result of
which he was or is subject to a judgment, decree or final order
enjoining future violations of, or prohibiting or mandating
activities subject to, federal or state securities law or finding
any violation with respect to such laws except as reported in
Item 2(d) of this Schedule 13D. 
<PAGE>
Gabelli Funds, Inc. 

Directors: 

     Mario J. Gabelli*

     Richard B. Black              Chairman of Raster Image
                                   Processing Systems; Chairman
                                   ECRM; Director of Archetype
                                   and Oak Technology; Director
                                   of The Morgan Group, Inc.;
                                   General Partner of KBA Part-  
                                   ners, Parker Plaza
                                   400 Kelby Street,
                                   Fort Lee, NJ 07029

     Charles C. Baum               Chairman, Director and Chief
                                   Executive Officer of The
                                   Morgan Group, Inc.;
                                   Secretary & Treasurer
                                   United Holdings              
                                   2545 Wilkens Avenue
                                   Baltimore, MD  21223

     Dr. Eamon M. Kelly            President
                                   Tulane University
                                   218 Gibson Hall
                                   6823 St. Charles Avenue
                                   New Orleans, LA  70118

     Marc J. Gabelli               Vice President


Officers:

     Mario J. Gabelli              Chairman, Chief Executive
                                   Officer and Chief Investment
                                   Officer
     
     Stephen G. Bondi              Vice President - Finance

     James E. McKee                Vice President, General 
                                   Counsel and Secretary


_____________________

     *    Mr. Gabelli is the Chairman, Chief Executive Officer and
Chief Investment Officer of Gabelli Funds, Inc. and of GAMCO
Investors, Inc.; Director/Trustee of all registered investment
companies advised by Gabelli Funds, Inc.; Chairman and Chief
Executive Officer of Lynch Corporation; Director of Spinnaker
Industries, Inc.; Director of the Morgan Group, Inc. 



GAMCO Investors, Inc.

Directors:
     
     Mario J. Gabelli
     Douglas R. Jamieson
     Joseph R. Rindler, Jr.
     Regina M. Pitaro
     F. William Scholz, II

Officers:
     
     Mario J. Gabelli              Chairman, Chief Executive     
                                   Officer and Chief             
                                   Investment Officer  

     Joseph R. Rindler, Jr.        President and Chief Operating
                                   Officer

     Douglas R. Jamieson           Executive Vice President 

     Stephen G. Bondi              Vice President

     James E. McKee                Vice President, General       
                                   Counsel and Secretary


Gabelli Securities, Inc.

Directors:

     Robert W. Blake               President of W.R. Blake
                                   & Sons, Inc.
                                   196-20 Northern Boulevard
                                   Flushing, NY  11358

     Douglas DeVivo                General Partner of ALCE
                                   Partners, L.P.
                                   One First Street, Suite 16
                                   Los Altos, CA  94022

     Ronald L. Gallatin            Consultant
                                   Gabelli Securities, Inc.
                                   One Corporate Center
                                   Rye, NY  10580

     Francine Sommer               Chief Executive Officer of
                                   General Partner of Gabelli
                                   Multimedia Partners, L.P.
                                   One Corporate Center
                                   Rye, NY  10580
Officers:
     
     Stephen G. Bondi              Vice President

     James E. McKee                Secretary




Gabelli & Company, Inc.

Directors:

     James G. Webster, III         Chairman 
     
     Stephen G. Bondi              See above

     Donald C. Jenkins             Director of Research

Officers:

     James G. Webster, III         Chairman 

     Stephen G. Bondi              Vice President 

     Walter K. Walsh               Compliance Officer

     James E. McKee                Secretary



GLI, Inc.
Directors:

     Mario J. Gabelli              See above-Gabelli Funds, Inc.


Officers:

     Mario J. Gabelli              Chairman and Chief Investment
                                   Officer

     Stephen G. Bondi              Vice President
<PAGE>
Gabelli Associates Limited

Directors:

     Mario J. Gabelli              See above-Gabelli Funds, Inc.

     
     MeesPierson  (Cayman)         British American Centre   
     Limited                       Dr. Roy's Drive- Phase 3
                                   Georgetown, Grand Cayman   
                                   Cayman Islands, British             
                                   WestIndies
     
Officers:

     Mario J. Gabelli              Chief Investment Officer

     Kevin Bromley                 Vice President, Treasurer and
                                   Assistant Secretary

     Sandra Wight                  Secretary and Assistant Treasurer



Gabelli International Limited

Directors:

     Mario J. Gabelli              See above-Gabelli Funds, Inc.
   
     MeesPierson  (Cayman)         British American Centre   
     Limited                       Dr. Roy's Drive- Phase 3
                                   Georgetown, Grand Cayman   
                                   Cayman Islands, British West Indies

Officers:

     Kevin Bromley                 Vice President, Treasurer, and      
                                   Assistant Secretary                 
                                   MeesPierson (Cayman) Limited
                                   British American Centre  
                                   Dr. Roy's Drive- Phase 3   
                                   Georgetown, Grand Cayman    
                                   Cayman Islands, British West Indies

     Sandra Wight                  Secretary and Assistant Treasurer
                                   Assistant Secretary                 
                                   MeesPierson (Cayman) Limited
                                   British American Centre  
                                   Dr. Roy's Drive- Phase 3   
                                   Georgetown, Grand Cayman    
                                   Cayman Islands, British West Indies



Gabelli Asset Management Company 
International Advisory Services Ltd.

Directors:

     Marc J. Gabelli               See above-Gabelli Funds, Inc.

     Stephen G. Bondi              See Above-Gabelli Funds, Inc.

     Joseph R. Rindler, Jr.        See above-GAMCO Investors, Inc.

     Michael J. Burns              Appleby, Spurling & Kempe
                                   Cedar House
                                   41 Cedar Avenue
                                   Hamilton, HM12
                                   Bermuda             

     Douglas Molyneux              Appleby, Spurling & Kempe
                                   Cedar House
                                   41 Cedar Avenue
                                   Hamilton, HM12
                                   Bermuda        


Lynch Corporation
8 Sound Shore Drive
Greenwich, CT  06830

Directors:

     Paul J. Evanson               President               
                                   Florida Light & Power Co.
                                   P.O Box 14000
                                   700 Universe Blvd.
                                   Juno Beach, Fl 33408

     Morris Berkowitz              Business Consultant
                                   163-43 Willets Point Blvd.
                                   Whitestone, NY 11357

     Mario J. Gabelli              See above-Gabelli Funds, Inc.

     Paul Woolard                  Business Consultant
                                   116 East 68th Street
                                   New York, NY 10021

     E. Val Cerutti                Business Consultant          
                                   Cerutti Consultants 
                                   227 McLain Street
                                   Mount Kisco, NY   10549






     Ralph R. Papitto              Chairman of the Board
                                   AFC Cable Systems, Inc.
                                   50 Kennedy Plaza
                                   Suite 1250
                                   Providence, RI  02903

     Salvatore Muoio               


Officers:

     Mario J. Gabelli              Chairman and Chief Executive   
                                   Officer

     Joseph H. Epel                Treasurer

     Robert E. Dolan               Chief Financial Officer 

     Carmine Ceraolo               Assistant Controller

     Robert A. Hurwich             Vice President-Administration,
                                   Secretary and General Counsel

Spinnaker Industries, Inc.
600 N. Pearl Street 
Suite 2160
Dallas, TX  75201

Directors:

     Joseph P. Rhein               5003 Central Avenue     
                                   Ocean City, NJ  08226
                                   
     Richard J. Boyle              The Boyle Group, Inc.             
                                   6110 Blue Circle Drive
                                   Suite 250           
                                   Minnetonka, MN  55343

     Ned N. Fleming, III           Boyle, Fleming, 
                                   George & Co., Inc.            
                                   600 N. Pearl Street
                                   Suite 2160
                                   Dallas, TX  75201

     Mario J. Gabelli              See above-Gabelli Funds, Inc.

     Robert E. Dolan               See above Lynch Corporation

     Anthonie C. van Ekris         Chairman and Chief 
                                   Executive Officer
                                   Balmac International, Inc.
                                   61 Broadway
                                   Suite 1900
                                   New York, NY  10006


Officers:

     James W. Toman                Controller          

     Ned N. Fleming, III           President

     Richard J. Boyle              Chairman and
                                   Chief Executive Officer

     Robert A. Hurwich             Secretary

     Mark A. Matteson              Vice President, Corporate
                                   Development


Entoleter, Inc.
251 Welton Street
Hamden, CT  06517

Directors:

     Ned N. Fleming, III           See above-Spinnaker

     Mark A. Matteson              See above-Spinnaker

     James W. Toman                See above-Spinnaker

     Robert P. Wentzel             See above Entoleter

     James Fleming                 230 Saugatuck Avenue, Unit 8
                                   Westport, CT  06880

Officers:

     James W. Toman                Chief Financial Officer
                                   and Secretary

     Robert P. Wentzel             President

     Anthony R. Massaro            Vice President-Manufacturing


<PAGE>
Western New Mexico Telephone Company
314 Yankee Street
Silver City, NM  88062

Directors:

     Jack C. Keen                  Chairman

     Jack W. Keen                  President

     Dr. Brian E. Gordon           Vice President

     Mary Beth Baxter              Secretary & Treasurer

     Robert E. Dolan               See above-Lynch Corporation

     Robert A. Hurwich             See above-Lynch Corporation

     Carmine Ceraolo               See above-Lynch Corporation

Officers:

     Jack C. Keen                  Chairman of the Board

     Jack W. Keen                  President

     Jack L. Bentley               Executive Vice President

     Dr. Brian E. Gordon           Vice President

     Charles M. Baxter             Sr. Vice President-Operations
     
     Mary Beth Baxter              Secretary & Treasurer

     Robert A. Hurwich             Assistant Treasurer



Inter-Community Telephone Company
P.O. Box A
Nome, ND  58062

Directors:

     Mary J. Carroll               See above-Lynch Corporation

     Carmine P. Ceraolo            See above-Lynch Corporation
                                   
     Robert E. Dolan               See above-Lynch Corporation

     Joseph H. Epel                See above-Lynch Corporation

     Robert A. Hurwich             See above-Lynch Corporation

     Leone A. Nilsen               President

     Roger J. Nilsen               P.O. Box 146
                                   Hannaford, ND 58448

     Duane A. Plecity              Secretary

     Harry B. Snyder               P.O. Box 131
                                   Buffalo, ND  58011
                                   
     Robert Snyder                 200 Broadway South
                                   Buffalo, ND  58011

Officers:

     Leone A. Nilsen               President
     
     Robert Snyder                 Vice President 
     
     Duane A. Plecity              Secretary
     
     Harry B. Snyder               Treasurer

     Joseph H. Epel                Assistant Treasurer

     Robert A. Hurwich             Assistant Secretary



Lynch Telecommunications Corporation
8 Sound Shore Drive
Greenwich, CT  06830

Directors:

     Richard A. Kiesling           2801 International Lane
                                   Suite 207
                                   Madison, WI  53740           

     Jack C. Keen                  See above-Western New Mexico
                                   Telephone Company

     Robert A. Snyder              See above-Inter-Community
                                   Telephone Company

Officers:

     Robert A. Hurwich             Secretary

     Mary Beth Baxter              Treasurer and 
                                   Assistant Secretary

     Robert E. Dolan               Controller





Lynch Telephone Corporation
8 Sound Shore Drive
Greenwich, CT  06830

Directors:

     Robert E. Dolan               Controller

     Jack C. Keen                  Chairman

Officers:

     Jack C. Keen                  Chairman

     Jack W. Keen                  President

     Robert A. Hurwich             Secretary

     Mary Beth Baxter              Treasurer and 
                                   Assistant Secretary

     Robert E. Dolan               Controller



                                             SCHEDULE II     
                                                                                
                                      INFORMATION WITH RESPECT TO               
                           TRANSACTIONS EFFECTED DURING THE PAST SIXTY DAYS OR  
                           SINCE THE MOST RECENT FILING ON SCHEDULE 13D (1)     
                                                                                
                                             SHARES PURCHASED        AVERAGE    
                                  DATE            SOLD(-)             PRICE(2)  
                                                                                
           COMMON STOCK-PORTEC INC                                              
                                                                                
          GIL II, LTD.                                                          
                                 1/06/97           40,000-            9.8750    
          GABELLI INTERNATIONAL LTD                                             
                                 1/06/97           38,000             9.8750    
          GAMCO INVESTORS, INC.                                                 
                                12/27/96            5,500-            9.6705    
                                12/27/96           17,200-             *DO      
                                12/26/96            6,500-            9.8077    
                                12/11/96            3,000-            9.9583    
                                12/10/96            1,100-           10.1250    
                                12/09/96            1,650-           10.1439    
                                12/03/96            5,000            10.1250    
                                12/02/96              500-           10.0000    
                                11/29/96            2,500-           10.2500    
                                11/19/96            1,100-            9.6250    
                                                                                
    
















                                                                            
          (1) UNLESS OTHERWISE INDICATED, ALL TRANSACTIONS WERE EFFECTED        
              ON THE NY STOCK EXCHANGE.                                         
                                                                                
          (2) PRICE EXCLUDES COMMISSION.                                        
                                                                                
          (*) RESULTS IN CHANGE OF DISPOSITIVE POWER AND BENEFICIAL OWNERSHIP.  
                                                                                
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