<ARTICLE> 5 <MULTIPLIER> 1,000 <PERIOD-TYPE> 9-MOS <FISCAL-YEAR-END> DEC-31-1996 <PERIOD-END> SEP-30-1996 <CASH> 227,645 <SECURITIES> 484,139 <RECEIVABLES> 239,485 <ALLOWANCES> 3,559 <INVENTORY> 109,695 <CURRENT-ASSETS> 1,112,972 <PP&E> 1,319,895 <DEPRECIATION> 525,877 <TOTAL-ASSETS> 1,999,517 <CURRENT-LIABILITIES> 365,269 <BONDS> 143,750 <COMMON> 1,283 <PREFERRED-MANDATORY> 0 <PREFERRED> 0 <OTHER-SE> 1,272,296 <TOTAL-LIABILITY-AND-EQUITY> 1,999,517 <SALES> 936,906 <TOTAL-REVENUES> 936,906 <CGS> 528,377 <TOTAL-COSTS> 528,377 <OTHER-EXPENSES> 258,298 <LOSS-PROVISION> 0 <INTEREST-EXPENSE> 10,241 <INCOME-PRETAX> 162,390 <INCOME-TAX> 45,469 <INCOME-CONTINUING> 116,523 <DISCONTINUED> 0 <EXTRAORDINARY> 0 <CHANGES> 0 <NET-INCOME> 116,523 <EPS-PRIMARY> 0.89 <EPS-DILUTED> 0.85