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GPO TIMER 70A, 1950's
Timer unit driven by exchange clock and used for timing functions in the exchange.
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- The Clock 70A provided a pulse of 30 seconds duration every hour, and one derived pulse every 24 hours.These pulses were used for routiner docket control equipment, for certain types of subscribers meter pulses and for the special equipment used in customer disputes over the units used.
.......... Kevin Hampton, Plaistow, London, 28th of October 2014