3840737

Information

• Patent Grant
• 3840737

• References
• Source

• Patent Number

  3,840,737

• Date Filed

  Not available

• Date Issued

  Tuesday, October 8, 1974
  50 years ago

• CPC

  • B61L3/246 - using coded current

• US Classifications

  • 246 - Railway switches and signals
  • 105 - Railway rolling stock
  • 318 - Electricity: motive power systems