[CITTERN] Preston tuner history

[Gregory Doc Rossi]

Does anyone know when the so-called Preston or watch-key tuner patent  
was applied for? or perhaps when it first appeared? I've realized  
that I know next to nothing about this ingenious device.  Where did  
he (if it was Preston) get the idea from?  Apart from the key, it's  
nothing like a watch.

Thanks in advance,

GDR



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