<ARTICLE> 5
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1993
<PERIOD-START>                             JAN-01-1994
<PERIOD-END>                               SEP-30-1994
<CASH>                                          74,702
<SECURITIES>                                         0
<RECEIVABLES>                                   32,179
<ALLOWANCES>                                     1,488
<INVENTORY>                                     16,496
<CURRENT-ASSETS>                                 3,228
<PP&E>                                          82,352
<DEPRECIATION>                                  50,289
<TOTAL-ASSETS>                                 173,860
<CURRENT-LIABILITIES>                           37,578
<BONDS>                                              0
<COMMON>                                        16,997
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<OTHER-SE>                                     114,451
<TOTAL-LIABILITY-AND-EQUITY>                   173,860
<SALES>                                         45,928
<TOTAL-REVENUES>                                46,980
<CGS>                                           24,322
<TOTAL-COSTS>                                   24,322
<OTHER-EXPENSES>                                17,831
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                  4,827
<INCOME-TAX>                                     2,153
<INCOME-CONTINUING>                              2,674
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     2,674
<EPS-PRIMARY>                                      .16
<EPS-DILUTED>                                      .16