US PATENT SUBCLASS 984 / 253
.~.~ Transposing, transcribing {G10G 1/04}

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984 /   HD   MUSICAL INSTRUMENTS

250  DD  AIDS FOR MUSIC (metronomes G04F 5/02; teaching music G09B 15/00) {G10G} {4}
251  DD  .~ Means for the representation of music {G10G 1/00} {2}
253.~.~ Transposing, transcribing {G10G 1/04}