1912 - France
Tasto telegrafico usato negli aerei equipaggiati con trasmettitore a scintilla rotante " Rouzet ".
Telegraph key used in airplanes with spark transmitter system " Rouzet " (rotary spark gear).
  (thanks to F9WT for info)

 

spark transmitter rouzet ms50

Image from Russ Kleinman site:  http://www.zianet.com/sparks/sparkmakers2.html



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