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Earth drilling bit
US 2,613,062 A
Filed
: 12/20/1950
Issued
: 10/07/1952
Est. Priority Date
: 12/20/1950
Status: Expired due to Term
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Current Assignee
Carl M. Harbert
Original Assignee
Carl M. Harbert
Inventors
Harbert, Carl M.
Application Number
US03/201,797
Time in Patent Office
657 Days
Field of Search
US Class Current
175/388
CPC Class Codes
E21B 10/44
Bits with helical conveying...
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