1721833

Information

• Patent Grant
• 1721833

• References
• Source

• Patent Number

  1,721,833

• Date Filed

  Not available

• Date Issued

  Tuesday, July 23, 1929
  95 years ago

• CPC

  • G08B5/008 - Traffic signalling mirrors

• US Classifications

  • 359 - Optical: systems and elements
  • 040 - Card, picture, or sign exhibiting
  • 404 - Road structure, process, or apparatus