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ID = 56572
Great Britain (UK)
Brand: Ediswan, Siemens Edison Swan Electric Co.; London
Developer: Fleming - valves; GB 
Tube type:  Signal Diode - one single system   Detector 
  <1925 rare.
Identical to Fleming_134R
Similar Tubes
Other base:

Base Swan-Bajonett B22=22 mm Sidecontact.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.6 Ampere / Direct / Battery =

This tube has a carbon filament. Catalogue Marconi Wireless Telegraph Co. Ltd, about 1910. The Fleming valves were made by the Edison and Swan United Electric Light Co. and marketed by Marconi Wireless telegraph Co. Ltd.

Information source - - Manufacturers Literature   1910 catalogue, page 44
British Radio Valves - The Vintage Years, Thrower   Pages 7-16
Saga of the Vacuum Tube, Tyne
Fleming_134R: Worthpoint photo
Fin Stewart

More ...
Fleming_134R: own collection
Peter den Boer

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