2419444

Information

• Patent Grant
• 2419444

• References
• Source

• Patent Number

  2,419,444

• Date Filed

  Not available

• Date Issued

  Tuesday, April 22, 1947
  77 years ago

• CPC

  • B61L5/1818 - using mobile coloured screen

• US Classifications

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