BS 1929:1953
Specification for screw threads and external dimensions of lamps for endoscopic and diagnostic instruments
standard by BSI Group, 01/29/1953
BS G 142:1953
Specification for heavy duty, electro-magnetically operated, single-pole circuit-breakers for extra-low voltage d.c. systems in aircraft
standard by BSI Group, 01/19/1953
BS 731-1:1952
Flexible steel conduit for cable protection and flexible steel tubing to enclose flexible drives. Flexible steel conduit and adaptors for the protection of electric cable
standard by BSI Group, 10/02/1952