1728558

Information

• Patent Grant
• 1728558

• References
• Source

• Patent Number

  1,728,558

• Date Filed

  Not available

• Date Issued

  Tuesday, September 17, 1929
  95 years ago

• CPC

  • B61L5/1827 - using light sources of different colours and a common optical system

• US Classifications

  • 246 - Railway switches and signals
  • 315 - Electric lamp and discharge devices: systems
  • 362 - Illumination