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Title: Cooke and Wheatstone�s double-needle telegraph, 1838 [Go to resource]
Description: W. F. Cooke's two-needle telegraph, c1838 License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Source: Science Museum Identifier: http://collectionsonline.nmsi.ac.uk/grab... Go to resource More Like this...
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