Gauging of threads on workpieces for railway vehicles; round thread, acme thread, rounded acme thread
铁路车辆工件上螺纹的测量；圆线 顶点线 顶点圆线
1975-03-01
BS 5550-2.4.3-1986
Cinematography. 16 mm film. Sound-Specification for the recorded characteristic for magnetic round records on 16 mm motion-picture film
电影摄影 16毫米胶片 声音16mm电影胶片上磁性圆记录的记录特性规范