Photographic transparency support with rotatable sound track...

Details Photographic transparency support with rotatable sound track... Photographic transparency support with rotatable sound track...

G - Physics

03

B

88/64

G03B 31/06 (2006.01) G03B 21/00 (2006.01) G03B 23/02 (2006.01) G03B 23/08 (2006.01)

Patent

CA 988340

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