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<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> MAY-31-2001
<PERIOD-END> NOV-30-2000
<CASH> 212
<SECURITIES> 0
<RECEIVABLES> 23,492
<ALLOWANCES> (30)
<INVENTORY> 2,743
<CURRENT-ASSETS> 45,115
<PP&E> 43,024
<DEPRECIATION> 21,458
<TOTAL-ASSETS> 80,799
<CURRENT-LIABILITIES> 21,297
<BONDS> 0
0
0
<COMMON> 96
<OTHER-SE> 54,081
<TOTAL-LIABILITY-AND-EQUITY> 80,799
<SALES> 82,914
<TOTAL-REVENUES> 82,914
<CGS> 74,326
<TOTAL-COSTS> 74,326
<OTHER-EXPENSES> 7,021
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> (129)
<INCOME-PRETAX> 1,567
<INCOME-TAX> 570
<INCOME-CONTINUING> 997
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> 997
<EPS-BASIC> 0.12
<EPS-DILUTED> 0.11
</TABLE>
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