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ID = 28667
Tube type:  Triode, vacuum 
Identical to O_Western = 104A
First year 1918 ?? Saga of the Vacuum Tube, Tyne page 98, 102, 280

Base UV-Base (4 Pins+Bayonet, USA 1914 WE)
Description Even lower plate impedance than the L. Other Code is 104A. 

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