2114931

Information

• Patent Grant
• 2114931

• References
• Source

• Patent Number

  2,114,931

• Date Filed

  Not available

• Date Issued

  Tuesday, April 19, 1938
  86 years ago

• CPC

  • G09B19/0007 - Signalling

• US Classifications

  • 434 - Education and demonstration
  • 116 - Signals and indicators