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Title: Rack containing a group of original Keith line switches, wit [Go to resource]
Description: Rack containing a group of original Keith line switches, with the associated master switch (from G.P.O. automatic branch exchange installed in July, 1912) License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Source: Science Museum Identifier: 1939-225 Go to resource More Like this...
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