2273231

Information

• Patent Grant
• 2273231

• References
• Source

• Patent Number

  2,273,231

• Date Filed

  Not available

• Date Issued

  Tuesday, February 17, 1942
  82 years ago

• CPC

  • B61L7/083 - Common line wire control using currents of different amplitudes, polarities, frequencies, or the like

• US Classifications

  • 340 - Communications: electrical
  • 246 - Railway switches and signals
  • 370 - Multiplex communications