US PATENT SUBCLASS 984 / 16
.~.~ Tremolo-producing devices {G10B 3/18}

Current as of: June, 1999
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984 /   HD   MUSICAL INSTRUMENTS

1  DD  ORGANS; HARMONIUMS {mouth organs or accordions subclasses 100+; Aspects of automatic actuation subclasses 200+; Combinations of microphones, pick-ups or amplifiers with musical instruments, electric organs subclasses 300+} {G10B} {2}
7  DD  .~ Details of, accessories for, organs, harmoniums, or the like {G10B 3/00} {11}
16.~.~ Tremolo-producing devices {G10B 3/18}