1515939

Information

• Patent Grant
• 1515939

• References
• Source

• Patent Number

  1,515,939

• Date Filed

  Not available

• Date Issued

  Tuesday, November 18, 1924
  100 years ago

• CPC

  • G08B5/008 - Traffic signalling mirrors

• US Classifications

  • 359 - Optical: systems and elements
  • 246 - Railway switches and signals
  • 404 - Road structure, process, or apparatus