Contactum 3-pin switched socket Designer (Organisation) Contactum Manufacturer Contactum Date 1937 - 1939 (circa)
Smart airbrick, 2 of 2 Designer (Organisation) Eco Coverage Technologies Manufacturer Eco Coverage Technologies Date 2022 (circa)
Round socket and plug Designer (Organisation) Ward and Goldstone Manufacturer Ward and Goldstone Date 1920 - 1929 (circa)