
<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               MAR-31-1997
<CASH>                                       2,341,396
<SECURITIES>                                         0
<RECEIVABLES>                               18,210,151
<ALLOWANCES>                                   233,373
<INVENTORY>                                 13,866,833
<CURRENT-ASSETS>                            37,757,618
<PP&E>                                      63,128,438
<DEPRECIATION>                              36,902,834
<TOTAL-ASSETS>                              68,426,050
<CURRENT-LIABILITIES>                       13,782,919
<BONDS>                                     15,000,000
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                     1,102,580
<OTHER-SE>                                  21,544,084
<TOTAL-LIABILITY-AND-EQUITY>                68,426,050
<SALES>                                     33,049,931
<TOTAL-REVENUES>                            33,049,931
<CGS>                                       17,401,747
<TOTAL-COSTS>                               30,804,529
<OTHER-EXPENSES>                               455,336
<LOSS-PROVISION>                                27,191
<INTEREST-EXPENSE>                             266,587
<INCOME-PRETAX>                              1,805,900
<INCOME-TAX>                                   863,463
<INCOME-CONTINUING>                            926,603
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   926,603
<EPS-PRIMARY>                                     2.57
<EPS-DILUTED>                                     2.57
        

</TABLE>
