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Title: Zither switch with open-wire multiple and two-motion ratchet [Go to resource]
Description: Zither switch with open-wire multiple and two-motion ratchet drive, 1894, soon rendered obsolete by Strowger selectors License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Temporal: 1894 Source: Science Museum Identifier: 1970-543 Go to resource More Like this...
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