1917837

Information

• Patent Grant
• 1917837

• References
• Source

• Patent Number

  1,917,837

• Date Filed

  Not available

• Date Issued

  Tuesday, July 11, 1933
  91 years ago

• CPC

  • B61L5/067 - using electromagnetic driving means
  • Y10T307/872 - Repetitive make and break

• US Classifications

  • 104 - Railways
  • 246 - Railway switches and signals
  • 307 - Electrical transmission or interconnection systems