Sound-on-film - Wikipedia

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Sound on film - Alchetron, The Free Social Encyclopedia

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When you press the play button on an audio player, besides the main head, what are the other components which touch the reel? - Quora

Sound film - Wikipedia

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What are those holes on the sides of film reels called? I don't mean the film perfs, I mean those 'gaps' on the side of the reel, also what are the different