<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