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http://www.google.co.uk/patents/US3800932?utm_source=gb-gplus-share
Patent US3800932 - COIN OPERATED CARD VENDING MACHINE
COIN OPERATED CARD VENDING MACHINE
Eugene Dana et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 3800932
Filing date
: 3 Nov 1972
Issue date
: 1974
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