Pentex production unit: B switch, 1965-1971
1965-1971
G.P.O type 600 relay
Hermetically sealed relay
Overcurrent relay by Reyrolle, no. 142568
Original Swedish "Birka" bimetal relay with heating coil
G.P.O. type 3000 relay
Slow acting relay
Telephone relay by S. G. Brown
Dash-pot relay, for timing delays (1920's)
1920-1930
Telegraph relay (1920's)
1920-1930
Western Union polar relay 17B, dated 14.12.1915
1915
Western Union combination Wheatstone relay
1915
Siemans Polarized Relay
1890
Telegraph relay (1920s)
1920-1930
Ferranti capacitor control
Ferranti model FR under current relay
Ferranti astatic voltage relay
Ferranti type FS relay
Magnetic Relay as used in RAE RTV 1
German "Birka" thermo-electric "wire-type" (no bimetal) relay in vacuum tube
Siemens high speed relay with dust cover
G.P.O. type 3000 relay
Laws Relay as used in early RAE RTV 1
Type GF Telephone Relays
1915-1925
Wireless Telephone Relay
1915-1930
Relay 556
Non-polarised relay
Single point telephone relay 1908
1908
Relay, calling and clearing
Allan and Brown relay
Relay, local Murray auto 2/2
Gulstad vibrating relay
Relay, devised by Professor Wheatstone, c. 1838
1838
Lieben-Reis Relay with base mounting unit
Siemens compound relay, 1876
1876
Relay by ATM, 1915
1915
General Post Office Type B landline telegraph relay capable of regeneration
1880-1920
Miniature microphone relay
744 relay no. 594
American 2 pole relay
Early pattern relay by A. Reyrolle and Co. Ltd.
1920-1950
Telephone relay
1915-1925
Earth Leakage Relay
1940-1960
Ferranti astatic voltage relay
Telephone Relay
1925-1935
Westinghouse signalling relay from the Glasgow Underground Railway by Westinghouse Brake & Saxby Signal Company.
Overload definite type time limit relay by Nalders
Lighthouse relay
Fork relay type D.17
Creed Relay, 1925
1925