859639

Information

• Patent Grant
• 859639

• References
• Source

• Patent Number

  859,639

• Date Filed

  Not available

• Date Issued

  Tuesday, July 9, 1907
  117 years ago

• CPC

  • B61L5/1836 - using light sources of different colours and seperate optical systems

• US Classifications

  • 246 - Railway switches and signals