1305638

Information

• Patent Grant
• 1305638

• References
• Source

• Patent Number

  1,305,638

• Date Filed

  Not available

• Date Issued

  Tuesday, June 3, 1919
  105 years ago

• CPC

  • G09B19/0007 - Signalling

• US Classifications

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