<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
UNAUDITED, CONSOLIDATED CONDENSED FINANCIAL STATEMENTS AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH UNAUDITED CONSOLIDATED CONDENSED FINANCIAL
STATEMENTS.
</LEGEND>

                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               JUN-30-1999
<CASH>                                          93,939
<SECURITIES>                                         0
<RECEIVABLES>                                  109,474<F1>
<ALLOWANCES>                                   (1,348)
<INVENTORY>                                     36,236
<CURRENT-ASSETS>                               244,870
<PP&E>                                         380,440
<DEPRECIATION>                               (220,848)
<TOTAL-ASSETS>                                 436,547
<CURRENT-LIABILITIES>                           79,655
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        13,458<F2>
<OTHER-SE>                                     319,533
<TOTAL-LIABILITY-AND-EQUITY>                   436,547
<SALES>                                        291,938
<TOTAL-REVENUES>                               291,938
<CGS>                                          229,310
<TOTAL-COSTS>                                  239,677
<OTHER-EXPENSES>                                 1,149
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                             (2,486)
<INCOME-PRETAX>                                 53,598
<INCOME-TAX>                                    18,893
<INCOME-CONTINUING>                             34,705
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    34,705
<EPS-BASIC>                                       1.28
<EPS-DILUTED>                                     1.28
<FN>
<F1>NOTES AND ACCOUNTS RECEIVABLE - TRADE ARE REPORTED NET OF ALLOWANCES FOR
DOUBTFUL ACCOUNTS IN THE CONSOLIDATED CONDENSED BALANCE SHEET.
<F2>COMMON STOCK AND ADDITIONAL PAID-IN-CAPITAL ARE COMBINED IN THE CONSOLIDATED
CONDENSED BALANCE SHEET.
</FN>