作废
BS 5550-1.4.3-1978 电影摄影技术.8mm胶片.声音.带有画面的8mm 胶片录音磁道位置和宽度以及磁录音和录放磁头间隙规范Cinematography - 8 mm film - Sound - Specification for location and width of magnetic striping and gaps of recording and reproducing heads for magnetic sound record on 8 mm motion-picture film with picture