3504173

Information

• Patent Grant
• 3504173

• References
• Source

• Patent Number

  3,504,173

• Date Filed

  Not available

• Date Issued

  Tuesday, March 31, 1970
  54 years ago

• CPC

  • B61L1/166 - Optical
  • B61L17/00 - Switching systems for classification yards
  • B61L25/021 - Measuring and recording of train speed
  • B61L25/026 - Relative localisation

• US Classifications

  • 246 - Railway switches and signals
  • 342 - Communications: directive radio wave systems and devices