2520866

Information

• Patent Grant
• 2520866

• References
• Source

• Patent Number

  2,520,866

• Date Filed

  Not available

• Date Issued

  Tuesday, August 29, 1950
  75 years ago

• CPC

  • B61L5/1863 - Lamp mountings on a mast
  • B61L29/24 - Means for warning road traffic that a gate is closed or closing, or that rail traffic is approaching

• US Classifications

  • 356 - Optics: measuring and testing
  • 033 - Geometrical instruments
  • 246 - Railway switches and signals
  • 359 - Optical: systems and elements