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http://www.google.com/patents/US3742470?utm_source=gb-gplus-share
Patent US3742470 - MEMORY DISC PACK DRIVE HAVING
MEMORY DISC PACK DRIVE HAVING
Ha; Carl P. Hollstein et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 3742470
Filing date
: Dec 30, 1971
Issue date
: Jun 26, 1973
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