Associated working of cameras or projectors with sound-recording or sound-reproducing means

Child Classifications

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• G03B 31/02 in which sound track is on a moving-picture film
• G03B 31/04 in which sound track is not on, but is synchronised with, a moving-picture film
• G03B 31/06 in which sound track is associated with successively-shown still pictures
• G03B 31/08 with fade-in and fade-out effects