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On Apr 14, 2013, at 10:34 PM, Dan Nelson <[log in to unmask]> wrote:

> What in the world is this Edison "tuning disc"  #3342B21 ?  
> It sounds like 800hz tone  but they didnt have tone generators back then did they?  maybe tuning fork over and over.
> Many thanks for info on what it was for  and how it was made 
> dnw