2353238

Information

• Patent Grant
• 2353238

• References
• Source

• Patent Number

  2,353,238

• Date Filed

  Not available

• Date Issued

  Tuesday, July 11, 1944
  80 years ago

• CPC

  • G09B19/0007 - Signalling

• US Classifications

  • 434 - Education and demonstration
  • D19 - Office supplies