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<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> JUL-01-2000
<CASH> 41,109,423
<SECURITIES> 54,423,951
<RECEIVABLES> 15,399,301
<ALLOWANCES> 0
<INVENTORY> 4,154,116
<CURRENT-ASSETS> 116,253,132
<PP&E> 53,814,459
<DEPRECIATION> 22,757,718
<TOTAL-ASSETS> 157,557,915
<CURRENT-LIABILITIES> 12,199,529
<BONDS> 1,750,000
0
0
<COMMON> 632,178
<OTHER-SE> 141,653,103
<TOTAL-LIABILITY-AND-EQUITY> 157,557,915
<SALES> 43,642,408
<TOTAL-REVENUES> 44,134,407
<CGS> 30,807,039
<TOTAL-COSTS> 35,334,974
<OTHER-EXPENSES> 0
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<CHANGES> 0
<NET-INCOME> 6,087,917
<EPS-BASIC> $.10
<EPS-DILUTED> $.09
</TABLE>
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