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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 F9WT for info)

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