1639717

Information

• Patent Grant
• 1639717

• References
• Source

• Patent Number

  1,639,717

• Date Filed

  Not available

• Date Issued

  Tuesday, August 23, 1927
  97 years ago

• CPC

  • B61G3/20 - Control devices

• US Classifications

  • 213 - Railway draft appliances
  • 191 - Electricity: transmission to vehicles
  • 246 - Railway switches and signals