China Head gaps andsound r GB Standards Search Result |
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GB/T 4637-1994 Head gaps andsound records for three-,four-,or six-track magnetic sound records on 35mmmotion-picture film containing no picture--Positions and width dimensions 35mm磁片上三声轨、四声轨和六声轨磁头隙缝的位置和宽度尺寸 - 英文版 |
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