3728932

Information

• Patent Grant
• 3728932

• References
• Source

• Patent Number

  3,728,932

• Date Filed

  Not available

• Date Issued

  Tuesday, April 24, 1973
  52 years ago

• CPC

  • G09B15/007 - using disc-shaped boards

• US Classifications

  • 084 - Music
  • 235 - Registers