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ISO 490:1993 Cinematography -- Magnetic stripes and magnetic recording head gaps for sound record on 16 mm motion-picture film perforated along one edge (Type 1) -- Positions and width dimensions
standard by International Organization for Standardization, 06/01/1993
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Specifies location and width of magnetic striping, location and width of gaps of magnetic heads, film projection speed, and longitudinal picture-sound displacement.