<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
FINANCIAL STATEMENTS CONTAINED IN THE BODY OF THE ACCOMPANYING FORM 10Q AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               JUN-30-1998
<CASH>                                          30,281
<SECURITIES>                                     5,471
<RECEIVABLES>                                   36,687
<ALLOWANCES>                                         0
<INVENTORY>                                     23,281
<CURRENT-ASSETS>                               113,135
<PP&E>                                         107,959
<DEPRECIATION>                                  80,289
<TOTAL-ASSETS>                                 181,799
<CURRENT-LIABILITIES>                           40,301
<BONDS>                                          4,235
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        14,374
<OTHER-SE>                                      90,359
<TOTAL-LIABILITY-AND-EQUITY>                   181,799
<SALES>                                         97,167
<TOTAL-REVENUES>                                98,925
<CGS>                                           71,231
<TOTAL-COSTS>                                   91,190
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 119
<INCOME-PRETAX>                                  7,616
<INCOME-TAX>                                     2,995
<INCOME-CONTINUING>                              4,621
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     4,621
<EPS-PRIMARY>                                      .38
<EPS-DILUTED>                                      .36