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Apparatus for digging holes
US 2,693,343 A
Filed
: 02/01/1951
Issued
: 11/02/1954
Est. Priority Date
: 02/01/1951
Status: Expired due to Term
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Petitions
4
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Current Assignee
Peter C. Darin
,
Russell A. Billett
Original Assignee
Peter C. Darin
,
Russell A. Billett
Inventors
Darin, Peter C.
,
Billett, Russell A.
Application Number
US03/208,873
Time in Patent Office
1,370 Days
Field of Search
US Class Current
175/321
CPC Class Codes
E21B 7/003
Drilling with mechanical co...
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