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http://www.google.co.uk/patents/US3099150?utm_source=gb-gplus-share
Patent US3099150 - COMBINATION PUSH BUTTON LOCK
COMBINATION PUSH BUTTON LOCK
Mathias M. Check et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 3099150
Filing date
: 19 Dec 1961
Issue date
: 30 Jul 1963
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