Art Deco style switched socket Designer (Organisation) Crabtree Electrical Manufacturer Crabtree Electrical Date 1930 - 1939 (circa)
DS brand socket with plug Designer (Person) Unknown Manufacturer Dorman Smith Date 1940 - 1945 (circa)
Contactum 3-pin switched socket Designer (Organisation) Contactum Manufacturer Contactum Date 1937 - 1939 (circa)
Round socket and plug Designer (Organisation) Ward and Goldstone Manufacturer Ward and Goldstone Date 1920 - 1929 (circa)