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Title: Velvet-lined cardboard valve-box inscribed "MULLARD: THE MAS [Go to resource]
Description: Velvet-lined cardboard valve-box inscribed "MULLARD: THE MASTER VALVE", and "for Radio: 1926-1927" License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Source: Science Museum Identifier: 1985-40 Go to resource More Like this...
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