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121-1

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ID = 52799
       
Country:
United States of America (USA)
Brand: Edison, Thomas A., North American Phonograph / National Phonograph; Orange, NJ
Tube type:  Light Bulbs - very special 
Identical to 121-1
Similar Tubes
Normally replaceable-slightly different:
  121_Lamp

Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Filament
Description Thermal test lamp unit. 
Information source -- Collector info (Sammler)   
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1211_edison_d.jpg
121-1
Emilio Ciardiello

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