73055063
Jun 13, 1975
Jul 13, 1976
ELECTRONIC TUNER, WHICH RESPONDS TO A MUSICAL SOUND EMITTED BY A MUSICAL INSTRUMENT BY CONVERTING IT INTO AN ELECTRICAL SIGNAL FOR INDICATION OF ANY DISPLACEMENT OF ITS TONE FROM A CORRESPONDING REFERENCE FREQUENCY (TONE SCALE), THUS ENABLING A TUNING OF THE INSTRUMENT
Electrical and Scientific Apparatus