1890137

Information

• Patent Grant
• 1890137

• References
• Source

• Patent Number

  1,890,137

• Date Filed

  Not available

• Date Issued

  Tuesday, December 6, 1932
  92 years ago

• CPC

  • A63G1/02 - with masking tunnels

• US Classifications

  • 104 - Railways
  • 191 - Electricity: transmission to vehicles
  • 246 - Railway switches and signals