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Hydraulic weight control and compen-sating apparatus for subsurface well bore devices
US 2,945,676 A
Filed
: 11/08/1956
Issued
: 07/19/1960
Est. Priority Date
: 11/08/1956
Status: Expired due to Term
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Current Assignee
Archer W. Kammerer Jr
Original Assignee
Archer W. Kammerer Jr
Inventors
Kammerer, Archer W. Jr.
Application Number
US03/621,158
Time in Patent Office
1,349 Days
Field of Search
US Class Current
92/161
CPC Class Codes
E21B 19/09
specially adapted for drill...
E21B 29/12
specially adapted for under...
E21B 7/128
from floating support with ...
Y10S 60/907
Working member positioned a...
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