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Black Diamond

Country:  United States of America (USA)
Manufacturer / Brand:  National Industries Inc.; (where?)
Year: 1923 Category: Detector-Radio (Crystal or diode, without tubes/transistors)
Main principle Crystal or Solid State Detector
Wave bands Broadcast only (MW).
Power type and voltage No Power needed
Loudspeaker - For headphones or amp.
Power out
from Model: Black Diamond - National Industries Inc.;
External source of data Ernst Erb
Source of data Radio Collector`s Guide 1921-1932

All listed radios etc. from National Industries Inc.; (where?)
Here you find 3 models, 0 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.