INSITUFORM EAST INC
SC 13D/A, 1999-03-01
CONSTRUCTION - SPECIAL TRADE CONTRACTORS
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

             INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
            TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO
                                  RULE 13d-2(a)

                                (Amendment No. 2)

                          INSITUFORM EAST, INCORPORATED
                                (Name of Issuer)

                                  COMMON STOCK
                            PAR VALUE $.04 PER SHARE
                         (Title of Class of Securities)

                                   457662-10-4
                                 (CUSIP Number)

                                Robert W. Erikson
                                  CERBCO, Inc.
                                3421 Pennsy Drive
                               Landover, MD 20785
                                 (301) 773-1784

                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                    Copy to:

                                John Paul Ketels
                               Rogers & Wells LLP
                              607 14th Street, N.W.
                              Washington, DC 20005
                                 (202) 434-0700

                                January 22, 1999
             (Date of Event that Requires Filing of this Statement)


If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  that is the subject of this  Schedule  13D, and is filing this
schedule  because of Rule  13d-1(e),  13d-1(f) or 13d-1(g),  check the following
box. /   /

                         (Continued on following pages)

                               (Page 1 of 9 Pages)

<PAGE>


CUSIP No. 457662-10-4             13D

1.  NAME OF REPORTING PERSONS
    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSON (ENTITIES ONLY)

    CERBERONICS, INC. 54-0850359

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
    ITEM 2(d) OR 2(e)                                                    /    /

6.  CITIZENSHIP OR PLACE OF ORGANIZATION

    Delaware

                 7.   SOLE VOTING POWER

                      1,514,141
NUMBER OF
SHARES           8.   SHARED VOTING POWER
BENEFICIALLY
OWNED BY
EACH             9.   SOLE DISPOSITIVE POWER
REPORTING
PERSON WITH:          1,514,141

                10.   SHARED DISPOSITIVE POWER


11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    1,514,141

12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES /    /


13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    34.75%

14. TYPE OF REPORTING PERSON

    CO


<PAGE>


CUSIP No. 457662-10-4             13D

1.  NAME OF REPORTING PERSONS
    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSON (ENTITIES ONLY)

    CERBCO, INC. 54-1448835

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
    ITEM 2(d) OR 2(e)                                                   /     /

6.  CITIZENSHIP OR PLACE OF ORGANIZATION

    Delaware

                      7.   SOLE VOTING POWER

                           1,514,141
NUMBER OF
SHARES                8.   SHARED VOTING POWER
BENEFICIALLY
OWNED BY
EACH                  9.   SOLE DISPOSITIVE POWER
REPORTING
PERSON WITH:               1,514,141

                     10.   SHARED DISPOSITIVE POWER


11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    1,514,141

12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES


13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    34.75%

14. TYPE OF REPORTING PERSON

    HC


<PAGE>


                                  SCHEDULE 13D

Item 1.  Security and Issuer.

         This Amendment No. 2, which relates to the Common Stock, par value $.04
per share (the "Common  Stock") of  Insituform  East,  Incorporated,  a Delaware
corporation  (the  "Issuer"),  including  shares of Common Stock  issuable  upon
conversion of the Issuer's  Class B Common Stock,  par value $.04 per share (the
"Class B Common  Stock"),  supplements  and amends the statement on Schedule 13D
originally  filed with the  Commission on March 25, 1985, as amended on June 19,
1986 (the "Statement").  The Issuer's principal executive offices are located at
3421 Pennsy Drive, Landover, Maryland 20785.

Item 2.  Identity and Background.

         (a)-(c) This Statement is filed on behalf of CERBCO, Inc. ("CERBCO"), a
Delaware corporation with its principal office and principal business address at
3421   Pennsy   Drive,   Landover,   Maryland   20785  and   CERBERONICS,   Inc.
("CERBERONICS"),  a Delaware corporation with its principal office and principal
business address at 300 Delaware Avenue, Suite 1704, Wilmington, Delaware 19801.
CERBERONICS  is a  wholly-owned  subsidiary  of CERBCO.  The name,  residence or
business  address and present  principal  occupation  or employment of executive
officers and directors of CERBERONICS and CERBCO (as indicated) are as follows:

                               Residence or Business   Principal Occupation
Name and Title                 Address                 or Employment
- --------------                 ---------------------   --------------------

Robert W. Erikson              300 Delaware Avenue     Chairman and Director
Chairman and Director          Suite 1704              of CERBERONICS and
of CERBERONICS and             Wilmington, DE 19801    President and Director
President and Director of                              of CERBCO
CERBCO                         3421 Pennsy Drive
                               Landover, MD 20785

George Wm. Erikson             300 Delaware Avenue     President, General
President, General Counsel     Suite 1704              Counsel and Director
and Director of                Wilmington, DE 19801    of CERBERONICS and
CERBERONICS and                                        Chairman and General
Chairman and General           3421 Pennsy Drive       Counsel of CERBCO
Counsel of CERBCO              Landover, MD 20785

Webb C. Hayes, IV              United Bank             Director and Vice
Director of CERBCO             1667 K Street, N.W.     Chairman of United Bank
                               Washington, DC 20006

Paul C. Kincheloe, Jr.         Kincheloe and           Partner in law firm of
Director of CERBCO             Schneiderman            Kincheloe and
                               4084 University Drive   Schneiderman
                               Suite 202
                               Fairfax, VA 22030

Robert F. Hartman              300 Delaware Avenue     Executive Vice President,
Executive Vice President,      Suite 1704              Secretary, Treasurer and
Secretary, Treasurer and       Wilmington, DE 19801    Director of CERBERONICS
Director of CERBERONICS                                and Vice President,
and Vice President, Secretary  3421 Pennsy Drive       Secretary and Treasurer 
and Treasurer of CERBCO        Landover, MD 20785      of CERBCO

Peter J. Winnington            Belfint, Lyons & Shuman Partner in accounting
Vice President and Director    200 W. Ninth Street Pl  firm of Belfint, Lyons &
of CERBERONICS                 Wilmington, DE 19899    Shuman

Peter C. Fulweiler             PNC Bank, Delaware      Vice President of PNC
Director of CERBERONICS        222 Delaware Avenue,    Bank, Delaware
                               17th Floor
                               Wilmington, DE 19801

         (d) Neither  CERBERONICS  nor CERBCO  has,  nor,  to the  knowledge  of
CERBERONICS and CERBCO has any of the persons  identified in this Item 2, during
the last five years, been convicted in a criminal proceeding  (excluding traffic
violations or similar misdemeanors).

         (e) Neither  CERBERONICS  nor CERBCO  has,  nor,  to the  knowledge  of
CERBERONICS and CERBCO has any of the persons  identified in this Item 2, during
the  last  five  years,  been a party to a civil  proceeding  of a  judicial  or
administrative body of competent jurisdiction and as a result of such proceeding
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 laws or finding any violation with respect to such laws.

         (f) Each individual named in this Item 2 is a citizen of the United
States of America.

Item 3.  Source and Amount of Funds or Other Consideration.

         The aggregate  consideration  for the  acquisitions of shares of Common
Stock  of the  Issuer  by  CERBERONICS  to  which  this  Statement  relates  was
$104,402.10.  Those  acquisitions  are  described  in more detail in Item 5. The
source of such funds was working capital of CERBERONICS.

Item 4.  Purpose of Transaction.

         From time to time  CERBERONICS  and  CERBCO  review the status of their
investment  in the Issuer with a view to  determining  how best to maximize  the
benefits of their  investment.  The options  considered  during  these  periodic
reviews  include  (i)  disposing  of some or all of the shares,  (ii)  acquiring
additional  shares,  or (iii)  offering to acquire all of the shares not already
beneficially  owned  by  CERBERONICS  and  CERBCO  for  cash,  securities,  or a
combination  of both.  In January  and  February  1999,  CERBERONICS  and CERBCO
purchased  90,500  additional  shares of Common Stock  because  CERBERONICS  and
CERBCO  believed the prices at which the shares were  trading to be  attractive.
All of the purchases  were made in open market  transactions,  executed  through
brokers on the National  Association of Securities  Dealers Automated  Quotation
System ("NASDAQ").

         On February 16, 1999, Insituform Technologies,  Inc. ("ITI"), by letter
to the Issuer,  proposed to acquire all of the outstanding  shares of the Issuer
for $2.50 per share in cash.  On the same day, ITI  published  its letter in the
form of a press  release.  CERBERONICS  and CERBCO intend to evaluate  carefully
their options in light of ITI's proposal.  Since  CERBERONICS and CERBCO control
more than a majority of the voting power of the Issuer,  CERBERONICS  and CERBCO
believe that they will be in a position to prevent any transaction  that they do
not support.

Item 5.  Interest in Securities of the Issuer.

         (a)  CERBERONICS  directly owns, and CERBCO (as a result of CERBERONICS
being its wholly-owned subsidiary) may be deemed to beneficially own, the shares
of Common  Stock and Class B Common  Stock of the Issuer,  described  below.  As
provided in the Issuer's Articles of  Incorporation,  shares of Common Stock and
shares of Class B Common Stock are identical in their rights,  entitlements  and
preferences  except that (i) each Common  Stock share  carries one vote  whereas
each Class B Common  Stock share  carries ten votes;  and (ii) the Common  Stock
shares are  entitled to elect as a class 25% of the  directors  of the  Issuer's
Board of Directors  and the Class B Common Stock shares are entitled to elect as
a class the remaining  number of directors of the Board.  After giving effect to
the  acquisitions  described  below  in this  Item  5,  CERBCO  and  CERBERONICS
beneficially  own 1,218,000 shares of Common Stock and 296,141 shares of Class B
Common  Stock.  In the  aggregate,  these  shares  represent  the  right to cast
4,179,410 (or 59.4%) of the 7,035,226  votes  eligible to be cast by the holders
of both classes of common stock.

              Shares of Class B Common  Stock are  convertible  at any time into
shares of Common  Stock on a  one-for-one  basis.  By reason of this  conversion
privilege,  CERBCO and CERBERONICS are deemed to beneficially  own the shares of
Common  Stock into which the Class B Common Stock  beneficially  owned by CERBCO
and  CERBERONICS  are convertible.  Therefore,  for purposes of this  Statement,
CERBCO and CERBERONICS are deemed to beneficially own in the aggregate 1,514,141
shares of Common Stock.

              George Wm.  Erikson,  President,  General  Counsel and Director of
CERBERONICS, and Chairman and General Counsel of CERBCO, is the beneficial owner
of 16,500 shares of the outstanding  Common Stock of the Issuer.  In addition to
being Directors of CERBCO, Robert W. Erikson, George Wm. Erikson, Webb C. Hayes,
IV, and Paul C.  Kincheloe,  Jr. are Directors of the Issuer.  As such, each has
been granted  options to purchase  75,000  shares of the  Issuer's  Common Stock
pursuant to its 1994 Directors Stock Option Plan.

         (b) Each of the  beneficial  owners set forth in paragraph (a) has sole
voting and  dispositive  power  over  their  respective  shares  referred  to in
paragraph (a).

         (c)  During  the past  sixty  days,  CERBERONICS  and  CERBCO  made the
following open market purchases of the Common Stock of the Issuer:

                 Date         Quantity           Share Price      Total Cost *
                 ----         --------           -----------      ------------
                1/19/99         1,000            1    3/8         $    1,404.95
                1/19/99         1,000            1    1/4         $    1,279.95
                1/19/99         1,000            1    1/4         $    1,279.95
                1/19/99         1,000            1    1/8         $    1,154.95
                1/19/99         1,500            1    1/16        $    1,638.75
                1/21/99         1,000            1    1/16        $    1,092.45
                1/21/99         2,000            1    1/16        $    2,185.00
                1/22/99         2,000            1    1/16        $    2,185.00
                1/22/99         5,000            1    1/16        $    5,462.50
                1/25/99         5,000            1    1/16        $    5,462.50
                1/26/99         5,000            1    1/16        $    5,462.50
                1/29/99        10,000            1    1/16        $   10,925.00
                2/1/99          1,000            1    1/32        $    1,061.20
                2/1/99          9,000            1    1/16        $    9,832.50
                2/1/99         10,000            1    1/16        $   10,925.00
                2/1/99         10,000            1    1/16        $   10,925.00
                2/2/99          1,500            1    1/8         $    1,732.50
                2/2/99          2,000            1    5/32        $    2,372.40
                2/2/99          1,000            1    3/16        $    1,217.50
                2/2/99          5,500            1    1/4         $    7,040.00
                2/3/99          3,000            1    1/16        $    3,277.50
                2/3/99          1,000            1    1/8         $    1,155.00
                2/3/99          1,000            1    1/4         $    1,280.00
                2/3/99         10,000            1    3/8         $   14,050.00
                               ------                              ------------
           Total               90,500                             $  104,402.10
                               ======                             =============

*  Inclusive of brokerage fees/commissions.

         (d)      Not Applicable.

         (e)     Not Applicable.

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

         Not Applicable.

Item 7.  Material to be Filed as Exhibits.

         Not Applicable.

<PAGE>

                                    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:  February 26, 1999



                                   CERBERONICS, Inc.


                                   By: /s/ Robert W. Erikson
                                   -----------------------------------------
                                   Robert W. Erikson
                                   Chairman
<PAGE>




                                    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:  February 26, 1999



                                   CERBCO, Inc.


                                   By: /s/ George Wm. Erikson
                                   -----------------------------------------
                                   George Wm. Erikson
                                   Chairman


<PAGE>

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

             INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
            TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO
                                  RULE 13d-2(a)

                                (Amendment No. 1)

                          INSITUFORM EAST, INCORPORATED
                                (Name of Issuer)

                              CLASS B COMMON STOCK
                            PAR VALUE $.04 PER SHARE
                         (Title of Class of Securities)

                                      NONE
                                 (CUSIP Number)

                                Robert W. Erikson
                                  CERBCO, Inc.
                                3421 Pennsy Drive
                               Landover, MD 20785
                                 (301) 773-1784

                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                    Copy to:

                                John Paul Ketels
                               Rogers & Wells LLP
                              607 14th Street, N.W.
                              Washington, DC 20005
                                 (202) 434-0700

                                February 16, 1999
             (Date of Event that Requires Filing of this Statement)


If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  that is the subject of this  Schedule  13D, and is filing this
schedule  because of Rule  13d-1(e),  13d-1(f) or 13d-1(g),  check the following
box.


                         (Continued on following pages)

                               (Page 1 of 8 Pages)



<PAGE>


CUSIP No. - None                        13D

1.  NAME OF REPORTING PERSONS
    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSON (ENTITIES ONLY)

    CERBERONICS, INC. 54-0850359

2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                     (a) /     /
                                                     (b) /     /

3.  SEC USE ONLY

4.  SOURCE OF FUNDS


5.  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
    ITEM 2(d) OR 2(e)                                                   /     /

6.  CITIZENSHIP OR PLACE OF ORGANIZATION

    Delaware

                      7.   SOLE VOTING POWER

                           296,141
NUMBER OF
SHARES                8.   SHARED VOTING POWER
BENEFICIALLY
OWNED BY
EACH                  9.   SOLE DISPOSITIVE POWER
REPORTING
PERSON WITH:               296,141

                     10.   SHARED DISPOSITIVE POWER


11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    296,141

12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES /    /


13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    99.5%

14. TYPE OF REPORTING PERSON

    CO


<PAGE>


CUSIP No. - None                    13D

1.  NAME OF REPORTING PERSONS
    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSON (ENTITIES ONLY)

    CERBCO, INC. 54-1448835

2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                     (a) /     /
                                                     (b) /     /

3.  SEC USE ONLY

4.  SOURCE OF FUNDS


5.  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
    ITEM 2(d) OR 2(e)                                                    /     /

6.  CITIZENSHIP OR PLACE OF ORGANIZATION

    Delaware

                      7.   SOLE VOTING POWER

                           296,141
NUMBER OF
SHARES                8.   SHARED VOTING POWER
BENEFICIALLY
OWNED BY
EACH                  9.   SOLE DISPOSITIVE POWER
REPORTING
PERSON WITH:               296,141

                     10.   SHARED DISPOSITIVE POWER


11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    296,141

12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES /    /


13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

    99.5%

14. TYPE OF REPORTING PERSON

    HC


<PAGE>


                                  SCHEDULE 13D

Item 1.  Security and Issuer.

         This  Amendment No. 1, which  relates to the Class B Common Stock,  par
value  $.04  per  share  (the  "Class  B  Common  Stock")  of  Insituform  East,
Incorporated, a Delaware corporation (the "Issuer"),  supplements and amends the
statement on Schedule 13D originally  filed with the Commission on June 19, 1986
(the "Statement").  The Issuer's principal executive offices are located at 3421
Pennsy Drive, Landover, Maryland 20785.

Item 2.  Identity and Background.

         (a)-(c) This Statement is filed on behalf of CERBCO, Inc. ("CERBCO"), a
Delaware corporation with its principal office and principal business address at
3421   Pennsy   Drive,   Landover,   Maryland   20785  and   CERBERONICS,   Inc.
("CERBERONICS"),  a Delaware corporation with its principal office and principal
business address at 300 Delaware Avenue, Suite 1704, Wilmington, Delaware 19801.
CERBERONICS  is a  wholly-owned  subsidiary  of CERBCO.  The name,  residence or
business  address and present  principal  occupation  or employment of executive
officers and directors of CERBERONICS and CERBCO (as indicated) are as follows:

                               Residence or Business   Principal Occupation
Name and Title                 Address                 or Employment
- --------------                 ---------------------   --------------------

Robert W. Erikson              300 Delaware Avenue     Chairman and Director
Chairman and Director          Suite 1704              of CERBERONICS and
of CERBERONICS and             Wilmington, DE 19801    President and Director
President and Director of                              of CERBCO
CERBCO                         3421 Pennsy Drive
                               Landover, MD 20785

George Wm. Erikson             300 Delaware Avenue     President, General
President, General Counsel     Suite 1704              Counsel and Director
and Director of                Wilmington, DE 19801    of CERBERONICS and
CERBERONICS and                                        Chairman and General
Chairman and General           3421 Pennsy Drive       Counsel of CERBCO
Counsel of CERBCO              Landover, MD 20785

Webb C. Hayes, IV              United Bank             Director and Vice
Director of CERBCO             1667 K Street, N.W.     Chairman of United Bank
                               Washington, DC 20006

Paul C. Kincheloe, Jr.         Kincheloe and           Partner in law firm of
Director of CERBCO             Schneiderman            Kincheloe and
                               4084 University Drive   Schneiderman
                               Suite 202
                               Fairfax, VA 22030

Robert F. Hartman              300 Delaware Avenue     Executive Vice President,
Executive Vice President,      Suite 1704              Secretary, Treasurer and
Secretary, Treasurer and       Wilmington, DE 19801    Director of CERBERONICS
Director of CERBERONICS                                and Vice President,
and Vice President, Secretary  3421 Pennsy Drive       Secretary and Treasurer 
and Treasurer of CERBCO        Landover, MD 20785      of CERBCO

Peter J. Winnington            Belfint, Lyons & Shuman Partner in accounting
Vice President and Director    200 W. Ninth Street Pl  firm of Belfint, Lyons &
of CERBERONICS                 Wilmington, DE 19899    Shuman

Peter C. Fulweiler             PNC Bank, Delaware      Vice President of PNC
Director of CERBERONICS        222 Delaware Avenue,    Bank, Delaware
                               17th Floor
                               Wilmington, DE 19801

         (d) Neither  CERBERONICS  nor CERBCO  has,  nor,  to the  knowledge  of
CERBERONICS and CERBCO has any of the persons  identified in this Item 2, during
the last five years, been convicted in a criminal proceeding  (excluding traffic
violations or similar misdemeanors).

         (e) Neither  CERBERONICS  nor CERBCO  has,  nor,  to the  knowledge  of
CERBERONICS and CERBCO has any of the persons  identified in this Item 2, during
the  last  five  years,  been a party to a civil  proceeding  of a  judicial  or
administrative body of competent jurisdiction and as a result of such proceeding
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 laws or finding any violation with respect to such laws.

         (f) Each individual named in this Item 2 is a citizen of the United
States of America.

Item 3.  Source and Amount of Funds or Other Consideration.

         Not Applicable.

Item 4.  Purpose of Transaction.

         From time to time  CERBERONICS  and  CERBCO  review the status of their
investment  in the Issuer with a view to  determining  how best to maximize  the
benefits of their  investment.  The options  considered  during  these  periodic
reviews  include  (i)  disposing  of some or all of the shares,  (ii)  acquiring
additional  shares,  or (iii)  offering to acquire all of the shares not already
beneficially  owned  by  CERBERONICS  and  CERBCO  for  cash,  securities,  or a
combination  of both.  In January  and  February  1999,  CERBERONICS  and CERBCO
purchased  90,500  additional  shares of Common Stock,  par value $.04 per share
(the "Common Stock") because CERBERONICS and CERBCO believed the prices at which
the shares were trading to be attractive. All of the purchases were made in open
market  transactions,  executed  through brokers on the National  Association of
Securities  Dealers  Automated  Quotation  System  ("NASDAQ").   There  were  no
transactions in shares of Class B Common Stock.

         On February 16, 1999, Insituform Technologies,  Inc. ("ITI"), by letter
to the Issuer,  proposed to acquire all of the outstanding  shares of the Issuer
for $2.50 per share in cash.  On the same day, ITI  published  its letter in the
form of a press  release.  CERBERONICS  and CERBCO intend to evaluate  carefully
their options in light of ITI's proposal.  Since  CERBERONICS and CERBCO control
more than a majority of the voting power of the Issuer,  CERBERONICS  and CERBCO
believe that they will be in a position to prevent any transaction  that they do
not support.

Item 5.  Interest in Securities of the Issuer.

         (a)  CERBERONICS  directly owns, and CERBCO (as a result of CERBERONICS
being its wholly-owned subsidiary) may be deemed to beneficially own, the shares
of Common  Stock and Class B Common  Stock of the Issuer,  described  below.  As
provided in the Issuer's Articles of  Incorporation,  shares of Common Stock and
shares of Class B Common Stock are identical in their rights,  entitlements  and
preferences  except that (i) each Common  Stock share  carries one vote  whereas
each Class B Common  Stock share  carries ten votes;  and (ii) the Common  Stock
shares are  entitled to elect as a class 25% of the  directors  of the  Issuer's
Board of Directors  and the Class B Common Stock shares are entitled to elect as
a class the  remaining  number of directors  of the Board.  Class B Common Stock
shares are  convertible  at any time into Common Stock  shares on a  one-for-one
basis. CERBCO and CERBERONICS  beneficially own 1,218,000 shares of Common Stock
and 296,141  shares of Class B Common  Stock.  In the  aggregate,  these  shares
represent the right to cast 4,179,410 (or 59.4%) of the 7,035,226 votes eligible
to be cast by the holders of both classes of common stock.

              George Wm.  Erikson,  President,  General  Counsel and Director of
CERBERONICS, and Chairman and General Counsel to CERBCO, is the beneficial owner
of 16,500 shares of the outstanding  Common Stock of the Issuer.  In addition to
being Directors of CERBCO, Robert W. Erikson, George Wm. Erikson, Webb C. Hayes,
IV, and Paul C.  Kincheloe,  Jr. are Directors of the Issuer.  As such, each has
been granted  options to purchase  75,000  shares of the  Issuer's  Common Stock
pursuant to its 1994 Directors Stock Option Plan.

         (b) Each of the  beneficial  owners set forth in paragraph (a) has sole
voting and  dispositive  power  over  their  respective  shares  referred  to in
paragraph (a).

         (c) Not Applicable.

         (d) Not Applicable.

         (e) Not Applicable.

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

         Not Applicable.

Item 7.  Material to be Filed as Exhibits.

         Not Applicable.

<PAGE>




                                    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:  February 26, 1999



                                   CERBERONICS, Inc.


                                   By: /s/ Robert W. Erikson
                                   -----------------------------------------
                                   Robert W. Erikson
                                   Chairman
<PAGE>




                                    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:  February 26, 1999



                                   CERBCO, Inc.


                                   By: /s/ George Wm. Erikson
                                   -----------------------------------------
                                   George Wm. Erikson
                                   Chairman


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