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Title: Dewald valve with radio case moulding made of dark brown phe [Go to resource]
Description: Dewald valve with radio case moulding made of dark brown phenolic, c.1935. Front inscribed "DEWALD". 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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