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http://www.google.co.uk/patents/US1596251?utm_source=gb-gplus-share
Patent US1596251 - SECRET RADIANT TELEPHONY
SECRET RADIANT TELEPHONY
Overview
Abstract
Drawings
Description
Claims
Patent number
: 1596251
Filing date
: 2 Dec 1922
Issue date
: 17 Aug 1926
Plain text
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