<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
FINANCIAL STATEMENTS INCLUDED IN 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-30-1998
<CASH>                                          31,246
<SECURITIES>                                     5,471
<RECEIVABLES>                                   33,063
<ALLOWANCES>                                         0
<INVENTORY>                                     26,423
<CURRENT-ASSETS>                               117,356
<PP&E>                                         110,638
<DEPRECIATION>                                  81,671
<TOTAL-ASSETS>                                 187,171
<CURRENT-LIABILITIES>                           44,952
<BONDS>                                          4,175
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        14,374
<OTHER-SE>                                      91,244
<TOTAL-LIABILITY-AND-EQUITY>                   187,171
<SALES>                                        147,146
<TOTAL-REVENUES>                               150,535
<CGS>                                          109,931
<TOTAL-COSTS>                                  138,158
<OTHER-EXPENSES>                                   956
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 119
<INCOME-PRETAX>                                 11,302
<INCOME-TAX>                                     4,320
<INCOME-CONTINUING>                              6,982
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     6,982
<EPS-PRIMARY>                                      .57
<EPS-DILUTED>                                      .55