2931108

Information

• Patent Grant
• 2931108

• References
• Source

• Patent Number

  2,931,108

• Date Filed

  Not available

• Date Issued

  Tuesday, April 5, 1960
  64 years ago

• CPC

  • G09B13/02 - Dummy practice keyboard apparatus

• US Classifications

  • 434 - Education and demonstration
  • 400 - Typewriting machines
  • D19 - Office supplies