US PATENT SUBCLASS 984 / 374
.~.~.~ Incorporating feed-back means, e.g., acoustic, etc. {G10H 3/24}


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984 /   HD   MUSICAL INSTRUMENTS

300  DD  ELECTRONIC MUSICAL INSTRUMENTS {structural combinations of microphones, pick-ups, or amplifiers with musical instruments subclasses 1+, 50+, and 100+; Instruments in which each note is generated by a different individually-actuated mechanical resonating structure and is amplified electrically subclasses 50+; Instruments in which each note is produced by a different electrically-vibrated sounding element subclasses 100+; Electronic circuits in general H03. {G10H} {4}
355  DD  .~ Instruments in which the tones are generated by electromechanical means {G10H 3/00} {3}
362  DD  .~.~ Using mechanical resonant generators, e.g., strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument {G10H 3/12} {3}
374.~.~.~ Incorporating feed-back means, e.g., acoustic, etc. {G10H 3/24} {1}
375  DD  .~.~.~.~> Using electric feed-back {G10H 3/26}