US PATENT SUBCLASS 984 / 255
.~.~ Using mechanical means only {G10G 3/02}

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984 /   HD   MUSICAL INSTRUMENTS

250  DD  AIDS FOR MUSIC (metronomes G04F 5/02; teaching music G09B 15/00) {G10G} {4}
254  DD  .~ Recording music in notation form, e.g., recording the mechanical operation of a musical instrument {performing, per se, B26F} {G10G 3/00} {2}
255.~.~ Using mechanical means only {G10G 3/02}