<ARTICLE> 5 <MULTIPLIER> 1,000 FINANCIAL DATA SCHEDULE <PERIOD-TYPE> 3-MOS <FISCAL-YEAR-END> DEC-31-1996 <PERIOD-END> MAR-31-1996 <CASH> 146,388 <SECURITIES> 544,911 <RECEIVABLES> 228,048 <ALLOWANCES> 3,465 <INVENTORY> 125,676 <CURRENT-ASSETS> 1,101,809 <PP&E> 1,206,677 <DEPRECIATION> 527,060 <TOTAL-ASSETS> 1,865,752 <CURRENT-LIABILITIES> 325,391 <BONDS> 143,750 <COMMON> 1,288 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <OTHER-SE> 1,223,127 <TOTAL-LIABILITY-AND-EQUITY> 1,865,752 <SALES> 311,352 <TOTAL-REVENUES> 311,352 <CGS> 176,849 <TOTAL-COSTS> 176,849 <OTHER-EXPENSES> 82,130 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 3,208 <INCOME-PRETAX> 58,941 <INCOME-TAX> 16,508 <INCOME-CONTINUING> 42,284 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 42,284 <EPS-PRIMARY> 0.32 <EPS-DILUTED> 0.31