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Drilling rig substructure
US 2,594,847 A
Filed
: 12/29/1947
Issued
: 04/29/1952
Est. Priority Date
: 12/29/1947
Status: Expired due to Term
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23 Citations
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Current Assignee
Charles S. Penfield
,
James N. Gregory
,
William F. Bates
Original Assignee
Charles S. Penfield
,
James N. Gregory
,
William F. Bates
Inventors
Bates, William F.
,
Gregory, James N.
,
Penfield, Charles S.
Application Number
US02/794,370
Time in Patent Office
1,583 Days
Field of Search
US Class Current
173/37
CPC Class Codes
E21B 15/00
Supports for the drilling m...
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