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http://www.google.ca/patents/US2405500?utm_source=gb-gplus-share
Patent US2405500 - MEANS FOR AND METHOD OF SECRET
MEANS FOR AND METHOD OF SECRET
Gustav Guanella et al
Overview
Abstract
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Description
Claims
Patent number
: 2405500
Filing date
: 26 Feb 1944
Issue date
: 6 Aug 1946
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