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physics (5) 5
accordions or concertinas (4) 4
acoustics (4) 4
musical instruments (4) 4
musical instruments not otherwise provided for (4) 4
percussion musical instruments (4) 4
stringed musical instruments (4) 4
wind musical instruments (4) 4
general tagging of cross-sectional technologies spanning over several sections of the ipc (3) 3
general tagging of new technological developments (3) 3
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technical subjects covered by former uspc cross-reference art collections [xracs] and digests (3) 3
cutting (2) 2
deaf-aid sets (2) 2
details common to machines for perforating, punching,cutting-out, stamping-out or severing (2) 2
electric communication technique (2) 2
electricity (2) 2
hand cutting tools (2) 2
loudspeakers, microphones, gramophone pick-ups or likeacoustic electromechanical transducers (2) 2
performing operations (2) 2
public address systems (2) 2
severing (2) 2
transporting (2) 2
basic electric elements (1) 1
checking-devices (1) 1
coin-freed or like apparatus (1) 1
electric switches (1) 1
emergency protective devices (1) 1
processes or means, e.g. batteries, for the direct conversionof chemical into electrical energy (1) 1
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selectors (1) 1
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07/1976
Conversion mechanism is disclosed for converting a coin-operated dispensing apparatus including an actuating means and a coin-receiving wheel coupled thereto... 
CHECKING-DEVICES | PHYSICS | COIN-FREED OR LIKE APPARATUS
Patent
10/1972
A kettledrum or the like incorporating a tuning mechanism whereby the timpanist may change the pitch of the drumhead over a range of at least a full octave by... 
ACOUSTICS | ACCORDIONS OR CONCERTINAS | STRINGED MUSICAL INSTRUMENTS | PERCUSSION MUSICAL INSTRUMENTS | WIND MUSICAL INSTRUMENTS | MUSICAL INSTRUMENTS | PHYSICS | MUSICAL INSTRUMENTS NOT OTHERWISE PROVIDED FOR
Patent
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