2133603

Information

• Patent Grant
• 2133603

• References
• Source

• Patent Number

  2,133,603

• Date Filed

  Not available

• Date Issued

  Tuesday, October 18, 1938
  86 years ago

• CPC

  • B61L5/1818 - using mobile coloured screen

• US Classifications

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