1389061

Information

• Patent Grant
• 1389061

• References
• Source

• Patent Number

  1,389,061

• Date Filed

  Not available

• Date Issued

  Tuesday, August 30, 1921
  103 years ago

• CPC

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

• US Classifications

  • 340 - Communications: electrical
  • 246 - Railway switches and signals
  • 362 - Illumination