3794977

Information

• Patent Grant
• 3794977

• References
• Source

• Patent Number

  3,794,977

• Date Filed

  Not available

• Date Issued

  Tuesday, February 26, 1974
  50 years ago

• CPC

  • B61L3/246 - using coded current

• US Classifications

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