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Title: Marconi instruments valve voltmeter, Type TF428BN, s/n 24926 [Go to resource]
Description: Marconi instruments valve voltmeter, Type TF428BN, s/n 24926 License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Source: Science Museum Identifier: 1985-64 Go to resource More Like this...
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