3878751

Information

• Patent Grant
• 3878751

• References
• Source

• Patent Number

  3,878,751

• Date Filed

  Not available

• Date Issued

  Tuesday, April 22, 1975
  49 years ago

• CPC

  • G10C3/12 - Keyboards Keys
  • G10H1/38 - Chord
  • G10H3/06 - using photoelectric pick-up means
  • G10H2210/601 - Chord diminished
  • G10H2210/621 - Chord seventh dominant

• US Classifications

  • 084 - Music
  • 984 - Musical instruments