CPC Subgroup
G09B 15/06 Devices for exercising or strengthening fingers or arms; Devices for holding fingers or arms in a proper position for playing (for teaching typing G09B13/00; exercising apparatus for developing or strengthening the muscles for physical training A63B21/00, A63B23/00)
Full Title
Teaching music (metronomes G04F5/02) > Devices for exercising or strengthening fingers or arms; Devices for holding fingers or arms in a proper position for playing (for teaching typing G09B13/00; exercising apparatus for developing or strengthening the muscles for physical training A63B21/00, A63B23/00)