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ID = 19888
United States of America (USA)
Brand: Cunningham Inc., E.T.; Harrison (NJ)
Developer: General Electric Co. (GE); Bridgeport CT, Syracuse NY 
Tube type:  LOCKED OFF PART (CODE 9) - see in Notes   Audio Frequency 
  <1925 rare.
Identical to C-301 = C301

Base UV-Base (4 Pins+Bayonet, USA 1914 WE)
Filament Vf 5 Volts / If 1 Ampere / Direct / Battery =

This is just an other way to write the name of the tube C301 - see there.

Text in other languages (may differ)
Tube prices 6 Tube prices (visible for members only)
Information source - - Manufacturers Literature   1922-1923
C-301: RMG
Robert Gillespie

Peter den Boer

C-301: own collection
Peter den Boer

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