Method of making duplicates of optical or sound recordings

Details Method of making duplicates of optical or sound recordings Method of making duplicates of optical or sound recordings

H - Electricity

04

N

181/26, 204/4, 1

H04N 5/82 (2006.01) B41C 3/08 (2006.01) G03G 5/022 (2006.01) G11B 23/00 (2006.01)

Patent

CA 942681

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