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ID = 28957
United States of America (USA)
Brand: Western Electric Company Inc.; New York (NY)
Tube type:  High-vacuum Rectifier   Power-supply 
Identical to 214A
First year 1922 Saga of the Vacuumtube, Tyne page 291
Successor Tubes 1926   214D  

Description Essentially the 211A with the grid omitted and reduced filament-anode spacing. 
Literature Saga of the Vacuumtube, Tyne   

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