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A WWI Marconi Trench CW Receiver, English, c.1915, marked to the top plate 'M.W.T.(Marconi Wireless Telegraph) Co Ltd, LONDON No738', case opens t...
An AVO Valve Characteristic Meter Mark IV, English, c.1959, marked to the front 'VALVE CHARACTERISTIC METER MARK IV' and marked AVO to the top dia...
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