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http://www.google.co.uk/patents/US3668654?utm_source=gb-gplus-share
Patent US3668654 - COMMUNICATING COMPUTER
COMMUNICATING COMPUTER
Charles H. Doersam et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 3668654
Filing date
: 19 Nov 1969
Issue date
: 6 Jun 1972
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