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http://www.google.co.uk/patents/US3863098?utm_source=gb-gplus-share
Patent US3863098 - TWO-AXIS POSITIONING CONTROL
TWO-AXIS POSITIONING CONTROL
Morton H. Mehr et al
Overview
Abstract
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Description
Claims
Patent number
: 3863098
Filing date
: 23 Feb 1973
Issue date
: 2 Jan 1975
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