<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE 
FINANCIAL STATEMENTS CONTAINED IN THE BODY OF THE ACCOMPANYING FORM 10-Q 
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               SEP-30-1997
<CASH>                                          15,980
<SECURITIES>                                         0
<RECEIVABLES>                                   40,799
<ALLOWANCES>                                         0
<INVENTORY>                                     10,784
<CURRENT-ASSETS>                                70,682
<PP&E>                                         141,371
<DEPRECIATION>                                  72,559
<TOTAL-ASSETS>                                 164,167
<CURRENT-LIABILITIES>                           18,079
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        90,901
<OTHER-SE>                                           0
<TOTAL-LIABILITY-AND-EQUITY>                   164,167
<SALES>                                         53,656
<TOTAL-REVENUES>                                53,656
<CGS>                                           43,042
<TOTAL-COSTS>                                   45,587
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                  8,682
<INCOME-TAX>                                     3,222
<INCOME-CONTINUING>                              5,460
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     5,460
<EPS-PRIMARY>                                     1.47
<EPS-DILUTED>                                     1.47