3693491

Information

• Patent Grant
• 3693491

• References
• Source

• Patent Number

  3,693,491

• Date Filed

  Not available

• Date Issued

  Tuesday, September 26, 1972
  52 years ago

• CPC

  • G10H3/20 - using a tuning fork, rod or tube
  • G10D13/085 - keyboard operated

• US Classifications

  • 084 - Music
  • 984 - Musical instruments