2221654

Information

• Patent Grant
• 2221654

• References
• Source

• Patent Number

  2,221,654

• Date Filed

  Not available

• Date Issued

  Tuesday, November 12, 1940
  84 years ago

• CPC

  • B61L23/168 - using coded current
  • B61L3/10 - using current passing between devices along the route and devices on the vehicle train
  • B61L3/121 - using magnetic induction

• US Classifications

  • 246 - Railway switches and signals