<ARTICLE> 5
<RESTATED> 
       
                                                                                            
<PERIOD-TYPE>                   3-MOS                   6-MOS                   9-MOS                   YEAR
<FISCAL-YEAR-END>                          JUN-30-1997             JUN-30-1997             JUN-30-1997             JUN-30-1997
<PERIOD-START>                             JUL-01-1996             JUL-01-1996             JUL-01-1996             JUL-01-1996
<PERIOD-END>                               SEP-30-1996             DEC-31-1996             MAR-31-1997             JUN-30-1997
<CASH>                                           8,606                   9,389                   8,817                  10,854
<SECURITIES>                                         0                       0                       0                       0
<RECEIVABLES>                                    9,433                   8,799                  10,032                  10,808
<ALLOWANCES>                                       256                     266                     275                     306
<INVENTORY>                                      6,004                   6,766                   7,281                   8,129
<CURRENT-ASSETS>                                24,936                  25,803                  26,942                  30,782
<PP&E>                                          30,982                  33,125                  34,893                  36,842
<DEPRECIATION>                                  15,220                  15,962                  16,727                  17,211
<TOTAL-ASSETS>                                  45,051                  47,292                  49,234                  54,512
<CURRENT-LIABILITIES>                            6,436                   6,668                   6,421                   9,693
<BONDS>                                            731                     715                     700                     684
<PREFERRED-MANDATORY>                                0                       0                       0                       0
<PREFERRED>                                          0                       0                       0                       0
<COMMON>                                        17,121                  17,480                  17,919                  18,072
<OTHER-SE>                                      19,010                  20,732                  22,508                  24,450
<TOTAL-LIABILITY-AND-EQUITY>                    45,051                  47,292                  49,234                  54,512
<SALES>                                         12,110                  24,300                  37,951                  52,741
<TOTAL-REVENUES>                                12,110                  24,300                  37,951                  52,741
<CGS>                                            6,743                  13,475                  21,166                  29,530
<TOTAL-COSTS>                                    6,743                  13,475                  21,166                  29,530
<OTHER-EXPENSES>                                 3,029                   6,072                   9,542                  13,171
<LOSS-PROVISION>                                     0                       0                       0                       0
<INTEREST-EXPENSE>                                   0                       0                       0                      56
<INCOME-PRETAX>                                  2,338                   4,753                   7,243                   9,984
<INCOME-TAX>                                       678                   1,378                   2,100                   2,873
<INCOME-CONTINUING>                              1,660                   3,375                   5,143                   7,111
<DISCONTINUED>                                       0                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0                       0
<CHANGES>                                            0                       0                       0                       0
<NET-INCOME>                                     1,660                   3,375                   5,143                   7,111
<EPS-PRIMARY>                                     0.26                    0.53                    0.81                    1.12
<EPS-DILUTED>                                     0.25                    0.50                    0.78                    1.08