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Title: Telephone-exchange ringing machine type 17700, by Walter Jon [Go to resource]
Description: Telephone-exchange ringing machine type 17700, by Walter Jones and Co. (Engineers) Ltd., c. 1970, and associated power-supply unit by Harmer and Simmons (S/N 72510) License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Temporal: 1970 Source: Science Museum Creator: Walter Jones and Co. (Engineers) Ltd. (maker) Identifier: 1985-604 Go to resource More Like this...-
Transmitter/receiver installation comprising:…Transmitter/receiver installation comprising: Transmitter, type…
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