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http://www.google.co.uk/patents/US3808372?utm_source=gb-gplus-share
Patent US3808372 - AUTOMATIC TIMEKEEPING AND RECORDER
AUTOMATIC TIMEKEEPING AND RECORDER
Leo A. Sielsch et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 3808372
Filing date
: 3 Nov 1972
Issue date
: 3 Apr 1974
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