1820713

Information

• Patent Grant
• 1820713

• References
• Source

• Patent Number

  1,820,713

• Date Filed

  Not available

• Date Issued

  Tuesday, August 25, 1931
  93 years ago

• CPC

  • B61L25/065 - for signalling systems on the vehicle using current conduction

• US Classifications

  • 246 - Railway switches and signals