2231520

Information

• Patent Grant
• 2231520

• References
• Source

• Patent Number

  2,231,520

• Date Filed

  Not available

• Date Issued

  Tuesday, February 11, 1941
  84 years ago

• CPC

  • B61L7/062 - Wiring diagrams
  • B61L29/226 - using track-circuits, closed or short-circuited by train or using isolated rail-sections

• US Classifications

  • 246 - Railway switches and signals