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OIL DERRICK ERECTION AND SUPPORT SYSTEM
US 3,483,933 A
Filed
: 11/24/1967
Issued
: 12/16/1969
Est. Priority Date
: 11/24/1967
Status: Expired due to Term
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Current Assignee
IRI International Corporation Pampa Texas
Original Assignee
Burton W. French
,
Norman D. Dyer
Inventors
Dyer, Norman D.
,
French, Burton W.
Application Number
US04/685,665
Time in Patent Office
753 Days
Field of Search
US Class Current
173/39
CPC Class Codes
E21B 15/00
Supports for the drilling m...
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