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Title: Mechanism of the Keith line switch, forerunner of the subscr [Go to resource]
Description: Mechanism of the Keith line switch, forerunner of the subscriber's line uniselector ( 1904-1920) License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Temporal: 1904-1920 Source: Science Museum Identifier: 1970-540 Go to resource More Like this...
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