3613494

Information

• Patent Grant
• 3613494

• References
• Source

• Patent Number

  3,613,494

• Date Filed

  Not available

• Date Issued

  Tuesday, October 19, 1971
  53 years ago

• CPC

  • G09B15/00 - Teaching music
  • G10C3/28 - Transposing devices

• US Classifications

  • 084 - Music