1812225

Information

• Patent Grant
• 1812225

• References
• Source

• Patent Number

  1,812,225

• Date Filed

  Not available

• Date Issued

  Tuesday, June 30, 1931
  93 years ago

• CPC

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

• US Classifications

  • 246 - Railway switches and signals