Title:
Choked reverse circulating sub
United States Patent 2903074


Inventors:
Layton, Gerald E.
Arbuckle, Walter K.
Application Number:
US61186356A
Publication Date:
09/08/1959
Filing Date:
09/25/1956
Assignee:
Layton, Gerald E.
Arbuckle, Walter K.
Primary Class:
Other Classes:
166/163, 166/318
International Classes:
E21B21/10; E21B34/06
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