<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE DECEMBER
31, 1997 FINANCIAL STATEMENTS AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO
SUCH FINANCIAL STATEMENTS.
</LEGEND>
       
                                                  
<PERIOD-TYPE>                   6-MOS                   6-MOS
<FISCAL-YEAR-END>                          JUN-30-1998             JUN-30-1997
<PERIOD-START>                             JUL-01-1997             JUL-01-1996
<PERIOD-END>                               DEC-31-1997             DEC-31-1996
<CASH>                                      15,269,625              12,680,350
<SECURITIES>                                         0                       0
<RECEIVABLES>                               47,311,130              37,476,031
<ALLOWANCES>                                 3,966,000               2,250,000
<INVENTORY>                                 32,879,734              28,249,464
<CURRENT-ASSETS>                           100,867,141              81,645,068
<PP&E>                                      64,389,130              66,055,000
<DEPRECIATION>                              28,392,990              34,956,803
<TOTAL-ASSETS>                             193,534,522             162,306,284
<CURRENT-LIABILITIES>                       22,349,132              20,780,919
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                       198,087                 197,187
<OTHER-SE>                                 152,855,104             131,439,071
<TOTAL-LIABILITY-AND-EQUITY>               193,534,522             162,306,284
<SALES>                                    105,369,334              77,113,720
<TOTAL-REVENUES>                           105,369,334              77,113,720
<CGS>                                       47,652,609              34,585,070
<TOTAL-COSTS>                               47,652,609              34,585,070
<OTHER-EXPENSES>                            38,864,588              28,279,076
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                             460,827                 197,615
<INCOME-PRETAX>                             19,078,678              15,537,054
<INCOME-TAX>                                 7,631,471               6,214,822
<INCOME-CONTINUING>                                  0                       0
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                11,447,207               9,322,232
<EPS-PRIMARY>                                     0.58                    0.48
<EPS-DILUTED>                                     0.56                    0.46