Music Patents (Class 84)
Instruments (Class 84/1)
Accessories (Class 84/453)

Foreign Patent Art Collections

Class-related foreign documents (Class 84/FOR000)

Digests

Plural speakers (Class 84/DIG1)
Preference networks (Class 84/DIG2)
Foldable; detachable; collapsible (Class 84/DIG3)
Chorus; ensemble; celeste (Class 84/DIG4)
Chiff (Class 84/DIG5)
Cathode-ray tube (Class 84/DIG6)
Electric key switch structure (Class 84/DIG7)
Keyed oscillators (Class 84/DIG8)
Filtering (Class 84/DIG9)
Feedback (Class 84/DIG10)
Frequency dividers (Class 84/DIG11)
Side; rhythm and percussion devices (Class 84/DIG12)
Gas discharge tube (Class 84/DIG13)
Harmonicas (Class 84/DIG14)
Accordions (Class 84/DIG15)
Crescendo (Class 84/DIG16)
Cabinets (Class 84/DIG17)
Tuning (Class 84/DIG18)
Light sensitive resistor (Class 84/DIG19)
Monophonic (Class 84/DIG20)
Mechanical resonator (Class 84/DIG21)
Chord organs (Class 84/DIG22)
Electronic gates for tones (Class 84/DIG23)
Piezoelectrical transducers (Class 84/DIG24)
Pedal clavier (Class 84/DIG25)
Reverberation (Class 84/DIG26)
Stereo (Class 84/DIG27)
Service manuals (Class 84/DIG28)
Tape (Class 84/DIG29)
Fret control (Class 84/DIG30)