<ARTICLE> 5
<RESTATED> 
<MULTIPLIER> 1,000
       
                                                                                            
<PERIOD-TYPE>                   3-MOS                   6-MOS                   9-MOS                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1996             DEC-31-1996             DEC-31-1996             DEC-31-1996
<PERIOD-END>                               MAR-31-1996             JUN-30-1996             SEP-30-1996             DEC-31-1996
<CASH>                                           7,231                   7,014                   4,210                   4,321
<SECURITIES>                                         0                       0                       0                       0
<RECEIVABLES>                                   38,705                  40,719                  45,512                  45,452
<ALLOWANCES>                                         0                       0                       0                       0
<INVENTORY>                                     15,930                  16,346                  17,694                  20,236
<CURRENT-ASSETS>                                63,224                  65,442                  68,779                  72,107
<PP&E>                                          74,821                  76,336                   78328                  79,542
<DEPRECIATION>                                  45,113                  46,500                  48,013                  49,107
<TOTAL-ASSETS>                                 108,162                 110,608                 114,841                 127,077
<CURRENT-LIABILITIES>                           22,741                  21,876                  23,784                  25,470
<BONDS>                                          9,370                  11,621                  12,422                  12,230
<PREFERRED-MANDATORY>                           16,118                       0                       0                       0
<PREFERRED>                                          0                       0                       0                       0
<COMMON>                                             0                  16,191                  16,385                  33,425
<OTHER-SE>                                      49,543                  50,512                  51,749                  53,825
<TOTAL-LIABILITY-AND-EQUITY>                   108,162                 110,608                 114,841                 127,077
<SALES>                                         33,189                  68,863                 106,771                 149,758
<TOTAL-REVENUES>                                33,189                  68,863                 106,771                 149,758
<CGS>                                           21,305                  44,168                  69,094                  97,258
<TOTAL-COSTS>                                   21,305                  44,168                  69,094                  97,258
<OTHER-EXPENSES>                                11,044                  21,750                  32,146                  44,836
<LOSS-PROVISION>                                     0                       0                       0                       0
<INTEREST-EXPENSE>                                 265                     538                     831                   1,113
<INCOME-PRETAX>                                    867                   2,548                   4,802                   6,247
<INCOME-TAX>                                       365                   1,046                   1,986                   1,484
<INCOME-CONTINUING>                                711                   1,695                   2,916                   5,027
<DISCONTINUED>                                       0                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0                       0
<CHANGES>                                            0                       0                       0                       0
<NET-INCOME>                                       711                   1,695                   2,916                   5,027
<EPS-PRIMARY>                                      .10                     .23                     .39                     .68
<EPS-DILUTED>                                      .10                     .23                     .37                     .66