<ARTICLE> 5
       
                             
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               DEC-31-1998
<CASH>                                      33,107,815
<SECURITIES>                                         0
<RECEIVABLES>                               35,709,009
<ALLOWANCES>                                   691,090
<INVENTORY>                                 35,492,440
<CURRENT-ASSETS>                           107,694,513
<PP&E>                                     150,709,005
<DEPRECIATION>                              73,932,512
<TOTAL-ASSETS>                             211,811,130
<CURRENT-LIABILITIES>                       26,422,618
<BONDS>                                     12,586,000
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                     9,577,621
<OTHER-SE>                                 132,720,991
<TOTAL-LIABILITY-AND-EQUITY>               211,811,130
<SALES>                                    187,853,060
<TOTAL-REVENUES>                           188,995,197
<CGS>                                      129,410,176
<TOTAL-COSTS>                              164,650,587
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                             723,048
<INCOME-PRETAX>                             23,621,562
<INCOME-TAX>                                 7,955,000
<INCOME-CONTINUING>                         15,666,562
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                15,666,562
<EPS-PRIMARY>                                     1.64
<EPS-DILUTED>                                     1.64