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Title: Double current telegraph key, made by Muirhead and Co [Go to resource]
Description: Double current telegraph key, made by Muirhead and Co. Ltd., serial No. 33500 License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Source: Science Museum Creator: Muirhead and Company Limited Identifier: 1968-464 Go to resource More Like this...
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