3423845

Information

• Patent Grant
• 3423845

• References
• Source

• Patent Number

  3,423,845

• Date Filed

  Not available

• Date Issued

  Tuesday, January 28, 1969
  55 years ago

• CPC

  • G09B13/02 - Dummy practice keyboard apparatus
  • G09B13/00 - Teaching typing

• US Classifications

  • 434 - Education and demonstration
  • D18 - Printing and office machinery