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http://www.google.ca/patents/US3484681?utm_source=gb-gplus-share
Patent US3484681 - REMAINING BATTERY CHARGE METER
REMAINING BATTERY CHARGE METER
Charies B. Grady et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 3484681
Filing date
: 27 Oct 1967
Issue date
: 16 Dec 1969
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