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http://www.google.com/patents/US3786866?utm_source=gb-gplus-share
Patent US3786866 - LOCKOUT FOR WELL SAFETY VALVE
LOCKOUT FOR WELL SAFETY VALVE
Tausch; Fred E. Watkins et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 3786866
Filing date
: Mar 6, 1973
Issue date
: Jan 2, 1974
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