| G | SK | SECTION G — PHYSICS |
| G10 | KL | MUSICAL INSTRUMENTS; ACOUSTICS |
| G10B | UKL | ORGANS; HARMONIUMS (mouth organs or accordions G10D; aspects of automatic actuation G10F; combinations of microphones, pick-ups or amplifiers with musical instruments, electronic organs G10H) |
| G10C | UKL | PIANOS (non-musical aspects of toy pianos A63H 5/00; aspects of automatic actuation G10F; combinations of microphones, pick-ups or amplifiers with musical instruments G10H) |
| G10D | UKL | MUSICAL INSTRUMENTS NOT OTHERWISE PROVIDED FOR (aspects of automatic actuation G10F; combinations of microphones, pick-ups or amplifiers with musical instruments G10H; sound-producing devices not regarded as musical instruments or parts thereof G10K) |
| G10F | UKL | AUTOMATIC MUSICAL INSTRUMENTS (non-musical aspects of toy instruments A63H 5/00; sound-recording or reproducing G11B; associated working with recording or reproducing apparatus G11B 31/02) |
| G10G | UKL | AIDS FOR MUSIC (metronomes G04F 5/02; teaching music G09B 15/00) |
| G10H | UKL | ELECTROPHONIC MUSICAL INSTRUMENTS (electronic circuits in general H03) |
| G10K | UKL | SOUND-PRODUCING DEVICES (sound-producing toys A63H 5/00; musical instruments or parts thereof, see the relevant subclass, e.g. G10D); ACOUSTICS NOT OTHERWISE PROVIDED FOR (fluid oscillators or pulse generators for fluid-pressure systems F15B 21/12; systems using the reflection or reradiation of acoustic waves G01S 15/00; generating seismic energy G01V 1/02; signalling or calling arrangements, alarm arrangements G08B; piezo-electric, electrostrictive or magnetostrictive elements in general H01L 41/00; transmission systems using infrasonic, sonic, or ultrasonic waves H04B 11/00; loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers H04R) [6] |
| G10L | UKL | SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION (sound input/output for computers G06F 3/16; digital data processing methods or equipment specially adapted for handling natural language data G06F 17/20; teaching or communicating with the blind, deaf or mute G09B 21/00; telephonic communication H04M) [4] |