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http://www.google.com.au/patents/US3870865?utm_source=gb-gplus-share
Patent US3870865 - METHOD AND APPARATUS FOR OPTICAL READING OF RECORDED DATA
METHOD AND APPARATUS FOR OPTICAL READING OF RECORDED DATA
Edward M. Schneiderhan et al
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Patent number
: 3870865
Filing date
: 5 Jul 1973
Issue date
: 1975
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