3717942

Information

• Patent Grant
• 3717942

• References
• Source

• Patent Number

  3,717,942

• Date Filed

  Not available

• Date Issued

  Tuesday, February 27, 1973
  51 years ago

• CPC

  • G09B1/20 - and bearing the symbols on a surface parallel to the axis of rotation
  • G09B17/00 - Teaching reading

• US Classifications

  • 434 - Education and demonstration
  • 040 - Card, picture, or sign exhibiting
  • 273 - Amusement devices: games