3441731

Information

• Patent Grant
• 3441731

• References
• Source

• Patent Number

  3,441,731

• Date Filed

  Not available

• Date Issued

  Tuesday, April 29, 1969
  55 years ago

• CPC

  • B61L3/246 - using coded current
  • B61L3/221 - using track circuits

• US Classifications

  • 246 - Railway switches and signals