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http://www.google.com/patents/US3273588?utm_source=gb-gplus-share
Patent US3273588 - FLOW CONTROL VALVE FOR USB IN A WELL TUBING STRING
FLOW CONTROL VALVE FOR USB IN A WELL TUBING STRING
William W. Dollison et al
Overview
Abstract
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Description
Claims
Patent number
: 3273588
Filing date
: Apr 4, 1961
Issue date
: Sep 20, 1966
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