<ARTICLE> 5
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               JUN-30-1999
<CASH>                                         190,530
<SECURITIES>                                   154,613
<RECEIVABLES>                                  338,745
<ALLOWANCES>                                     4,914
<INVENTORY>                                    191,485
<CURRENT-ASSETS>                               977,188
<PP&E>                                       2,135,410
<DEPRECIATION>                                 888,869
<TOTAL-ASSETS>                               2,755,715
<CURRENT-LIABILITIES>                          458,786
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                         1,460
<OTHER-SE>                                   1,484,623
<TOTAL-LIABILITY-AND-EQUITY>                 2,755,715
<SALES>                                        964,629
<TOTAL-REVENUES>                               964,629
<CGS>                                          616,289
<TOTAL-COSTS>                                  616,289
<OTHER-EXPENSES>                               309,334
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                            (20,200)
<INCOME-PRETAX>                                 23,001
<INCOME-TAX>                                     9,160
<INCOME-CONTINUING>                             13,841
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                     (91,774)
<NET-INCOME>                                  (77,933)
<EPS-BASIC>                                     (0.54)
<EPS-DILUTED>                                   (0.52)