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Back Ground of the Invention and prior art
   Japan    U.S.A.  click on links
                                                                                                         

RON HOAG OPTICAL PICKUPS FOR STRINGED
INSTRUMENTS WAS INVENTED IN 1968 AND WAS AT THE THE 1969, 1971, 1975, and 2001
NAMM SHOWS.     click on links            

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Mexican Patent #121278