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http://www.google.ca/patents/US3423872?utm_source=gb-gplus-share
Patent US3423872 - TRANSPARENT SPHERE WITH ROTATING BALLS THEREIN
TRANSPARENT SPHERE WITH ROTATING BALLS THEREIN
Ashford B.ttodson et al
Overview
Abstract
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Description
Claims
Patent number
: 3423872
Filing date
: 14 Sep 1964
Issue date
: 28 Jan 1969
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