2883767

Information

• Patent Grant
• 2883767

• References
• Source

• Patent Number

  2,883,767

• Date Filed

  Not available

• Date Issued

  Tuesday, April 28, 1959
  65 years ago

• CPC

  • G09B11/08 - Teaching shorthand

• US Classifications

  • 434 - Education and demonstration
  • 283 - Printed matter