3902690

Information

• Patent Grant
• 3902690

• References
• Source

• Patent Number

  3,902,690

• Date Filed

  Not available

• Date Issued

  Tuesday, September 2, 1975
  49 years ago

• CPC

  • B61L1/20 - Safety arrangements for preventing or indicating malfunction of the device
  • B61K7/16 - Positive railway stops

• US Classifications

  • 246 - Railway switches and signals