3251989

Information

• Patent Grant
• 3251989

• References
• Source

• Patent Number

  3,251,989

• Date Filed

  Not available

• Date Issued

  Tuesday, May 17, 1966
  58 years ago

• CPC

  • B61L3/225 - using separate conductors along the route
  • B61L13/047 - controlling inductively or magnetically
  • B61L25/04 - Indicating or recording train identities

• US Classifications

  • 246 - Railway switches and signals
  • 455 - Telecommunications