Home / Standards / GB/T 4637 GB/T 4637 Active 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 Standard Type GBT ICS 37.060 CCS A15 Status 现行 Issue Date 1994-12-28 Implementation 1995-08-01 Responsible Dept 国家电影局 Drafting Unit 国家电影局