2975533

Information

• Patent Grant
• 2975533

• References
• Source

• Patent Number

  2,975,533

• Date Filed

  Not available

• Date Issued

  Tuesday, March 21, 1961
  63 years ago

• CPC

  • G09B19/0007 - Signalling

• US Classifications

  • 434 - Education and demonstration
  • 446 - Amusement devices: toys