3921945

Information

• Patent Grant
• 3921945

• References
• Source

• Patent Number

  3,921,945

• Date Filed

  Not available

• Date Issued

  Tuesday, November 25, 1975
  49 years ago

• CPC

  • B61L15/0081 - On-board diagnosis or maintenance
  • B61F9/005 - by use of non-mechanical means

• US Classifications

  • 246 - Railway switches and signals
  • 073 - Measuring and testing
  • 188 - Brakes
  • 340 - Communications: electrical