3139780

Information

• Patent Grant
• 3139780

• References
• Source

• Patent Number

  3,139,780

• Date Filed

  Not available

• Date Issued

  Tuesday, July 7, 1964
  60 years ago

• CPC

  • G10C3/163 - the actions being mounted in a plane below the keyboard

• US Classifications

  • 084 - Music