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Repeater, triple wound

Repeater, enclosed in box

Preece's electric semaphore repeater 1862, comprising a small electro-magnetically operated semophore on wooden base, with cover in two parts.

Preece's electric semaphore repeater 1862

Four-wire telephone repeater, 1932

Four-wire telephone repeater, 1932

1932
Electronic repeater comprising:- a. Electronic single element dynamometer wattmeter, b. Switchboard indicator, c. Power Unit 230v 50 cycles

Electronic repeater