1469750

Information

• Patent Grant
• 1469750

• References
• Source

• Patent Number

  1,469,750

• Date Filed

  Not available

• Date Issued

  Tuesday, October 2, 1923
  101 years ago

• CPC

  • G09B13/02 - Dummy practice keyboard apparatus

• US Classifications

  • 434 - Education and demonstration
  • 235 - Registers