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standard by International Organization for Standardization, 08/01/1985
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This International Standard specifies the location and dimen-sions of head gaps for recording three-, four-, or six-track magnetic sound records on 35mm (perforated in accordance with ISO 491), and one single-track record on 17,5 mm motion-picture film. It also specifies the assignment of records to the various tracks on the magnetic coating on the film in relation to the direction of film travel.