3890875

Information

• Patent Grant
• 3890875

• References
• Source

• Patent Number

  3,890,875

• Date Filed

  Not available

• Date Issued

  Tuesday, June 24, 1975
  49 years ago

• CPC

  • G09B15/008 - with indication of the keys or strings to be played on instruments

• US Classifications

  • 084 - Music