HELMERICH & PAYNE INC
UTICA AT 21ST ST, TULSA OK 74114, 9187425531
DRILLING OIL & GAS WELLS
1999 SEC Filings
HELMERICH & PAYNE INC, 10-K, 1999-12-28
HELMERICH & PAYNE INC, 10-Q, 1999-08-13
HELMERICH & PAYNE INC, 10-Q, 1999-05-14
HELMERICH & PAYNE INC, 8-K, 1999-02-16
HELMERICH & PAYNE INC, 10-Q, 1999-02-16
HELMERICH & PAYNE INC, SC 13G/A, 1999-02-11
HELMERICH & PAYNE INC, SC 13G/A, 1999-02-04
HELMERICH & PAYNE INC, DEF 14A, 1999-01-27
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