BS 1655:1950
Specification for flanged automatic control valves for the process control industry (face-to-face dimensions)
standard by BSI Group, 07/12/1950
BS 5550-3.9.1:1980
Cinematography. 35 mm film. Projector spools. Specification for 35 mm film spools of 610 m capacity (38 cm size) for release prints
standard by BSI Group, 10/03/1949