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ISO 9525:1988 Cinematography -- Recording head gaps for two sound records on 17,5 mm magnetic film -- Positions and width dimensions
standard by International Organization for Standardization, 08/01/1988
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Full Description
This International Standard specifies the lateral positions and width dimensions of the recording heads for two magnetic Sound records and a control track on 17,5 mm Single perforated magnetic recording film.
It also specifies the reproducing velocity of the film travel.