BS 46-3:1951
Keys and keyways and taper pins. Specification for solid and split taper pins for general engineering purposes
standard by BSI Group, 12/20/1951
BS 1782:1951
Specification for couplings for suction and delivery hose (1 1/2 in. to 8 in. nominal sizes) other than fire hose couplings
standard by BSI Group, 08/22/1951