UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549


SCHEDULE 13G

(Under the Securities Exchange Act of 1934)
(Amendment No. 5)*

Matrix Service Co.
------------------------------------------------------
(Name of Issuer)

COMMON STOCK
---------------------------------
(Title of Class of Securities)

576853105
-----------------------
(Cusip Number)

December 31, 1999
_________________________________
(Date of event which requires filing of this statement)

Check the appropriate box to designate the rule pursuant
to which this schedule is filed:

[X]  Rule 13d-1    (b)
[ ]  Rule 13d-1    (c)
[ ]  Rule 13d-1    (d)

*The remainder of this cover page shall be filled out for a 
reporting person's initial filing of this form with respect to the 
subject class of securities, and for any subsequent amendment 
containing information which would alter the disclosures provided in 
a prior cover page.

The information required in the remainder of this cover page shall 
not be deemed to be "filed" for the purpose of Section 18 of the 
Securities Exchange Act of 1934 ("Act") or otherwise subject to the 
liabilities of that section of the Act, but shall be subject to all 
other provisions of the Act (however, see the Notes.)

[Continued on the following page(s)]
Page 1 of 4 Pages


CUSIP No.576853105Page 2 of 4 Pages  
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1.Name of reporting person
 S.S. or I.R.S. identification no. of above person

David L. Babson and Company Incorporated
04-1054788
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2.Check the appropriate box if a member of a group
(a)(   )
(b)( X )
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3.SEC use only

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4.Citizenship or place of organization
Massachusetts

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 Number of shares beneficially owned by each reporting person with

5.  Sole Voting Power

998,100.00
__________________________

6.  Shared Voting Power

0
_____________________________

7.  Sole Dispositive Power

998,100.00
______________________________

8.Shared Dispositive Power
0
---------------------------------------------------------------
9.Aggregate amount beneficially owned by each reporting person

  998,100.00
---------------------------------------------------------------
10.Check if the aggregate amount in row (9) excludes certain shares*

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11.Percent of class represented by amount in row 9
     10.35%
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12.Type of Reporting person
IA

Page 3 of 4 Pages Cusip #:576853105


SCHEDULE 13G


ITEM 1(A):  NAME OF ISSUER:
Matrix Service Co.

1(B):  ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:

10701 East Ute Street
Tulsa, OK 74116-1514

ITEM 2(A):  NAME OF PERSON FILING:

David L. Babson and Company Incorporated ("DLB")

ITEM 2(B):  ADDRESS OF PRINCIPAL BUSINESS OFFICE:

One Memorial Drive
Cambridge, Massachusetts  02142-1300

ITEM 2(C):  CITIZENSHIP:

See Item 4 of Cover Page

ITEM 2(D):  TITLE OF CLASS OF SECURITIES:

See Cover Page

ITEM 2(E):  CUSIP NUMBER:

See Cover Page

ITEM 3:  TYPE OF REPORTING PERSON:

If this statement is filed pursuant to Sections 240.13d-1 (b) 
or 240.13d-2 (b) or (c), check whether the filing person is a:

(e)  [x]  An investment adviser in accordance with
          Section 240.13d-1 (b) (1) (ii) (E)

ITEM 4:  OWNERSHIP:

(a)AMOUNT BENEFICIALLY OWNED:  DLB, in its capacity as
investment adviser, may be deemed the beneficial owner of 998,100.00
shares of common stock of the Issuer which are owned by numerous 
investment counselling clients.

(b)PERCENT OF CLASS: 10.35%

(c)For information on voting and dispositive power with respect to the 
above listed shares, see Items 5 - 8 of Cover Page.

Page 4 of 4 PagesCusip #: 576853105

ITEM 5:  OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS:

Not Applicable

ITEM 6:  OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON:

Not Applicable

ITEM 7: IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH 
ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING 
COMPANY:

Not Applicable

ITEM 8:  IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP:

Not Applicable

ITEM 9:  NOTICE OF DISSOLUTION OF GROUP:

Not Applicable

ITEM 10:  CERTIFICATION:

By signing below I certify that, to the best of my knowledge and 
belief, the securities referred to above were acquired in the 
ordinary course of business and were not acquired for the purpose of 
and do not have the effect of changing or influencing the control of 
the issuer of such securities and were not acquired in connection 
with or as a participant in any transaction having such purpose or 
effect.

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.

Date: February 7, 2000

Signature:  --//John E. Deitelbaum//--
Name/Title:  JOHN E. DEITELBAUM
Counsel