1342520

Information

• Patent Grant
• 1342520

• References
• Source

• Patent Number

  1,342,520

• Date Filed

  Not available

• Date Issued

  Tuesday, June 8, 1920
  104 years ago

• CPC

  • G09B19/0007 - Signalling

• US Classifications

  • 273 - Amusement devices: games
  • 434 - Education and demonstration