3821457

Information

• Patent Grant
• 3821457

• References
• Source

• Patent Number

  3,821,457

• Date Filed

  Not available

• Date Issued

  Friday, June 28, 1974
  50 years ago

• CPC

  • G10H1/36 - Accompaniment arrangements
  • G10H1/02 - Means for controlling the tone frequencies
  • G10H1/18 - Selecting circuits
  • Y10S84/08 - Keyed oscillators

• US Classifications

  • 084 - Music
  • 984 - Musical instruments