GB/T 4637-1994 标准详情
GB/T 4637-1994
现行
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
Head gaps andsound records for three-,four-,or six-track magnetic sound records on 35mmmotion-picture film containing no picture--Positions and width dimensions