<ARTICLE> 5 <LEGEND> THIS SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM THE CONSOLIDATED BALANCE SHEET AND THE CONSOLIDATED STATEMENT OF INCOME FILED AS PART OF THE ANNUAL REPORT ON FORM 10-Q AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH ANNUAL REPORT ON FORM 10-Q. </LEGEND> <MULTIPLIER> 1,000 <PERIOD-TYPE> 3-MOS <FISCAL-YEAR-END> DEC-31-1996 <PERIOD-END> MAR-31-1996 <CASH> $329,693 <SECURITIES> $0 <RECEIVABLES> $158,916 <ALLOWANCES> $1,769 <INVENTORY> $86,055 <CURRENT-ASSETS> $595,029 <PP&E> $1,095,340 <DEPRECIATION> $614,569 <TOTAL-ASSETS> $1,165,485 <CURRENT-LIABILITIES> $252,773 <BONDS> $0 <PREFERRED-MANDATORY> $0 <PREFERRED> $0 <COMMON> $661 <OTHER-SE> $730,387 <TOTAL-LIABILITY-AND-EQUITY> $1,165,485 <SALES> $270,171 <TOTAL-REVENUES> $270,171 <CGS> $196,060 <TOTAL-COSTS> $236,731 <OTHER-EXPENSES> $0 <LOSS-PROVISION> $0 <INTEREST-EXPENSE> $1,841 <INCOME-PRETAX> $191,523 <INCOME-TAX> $75,899 <INCOME-CONTINUING> $115,624 <DISCONTINUED> $0 <EXTRAORDINARY> $0 <CHANGES> $0 <NET-INCOME> $115,624 <EPS-PRIMARY> $1.73 <EPS-DILUTED> $1.73