1768539

Information

• Patent Grant
• 1768539

• References
• Source

• Patent Number

  1,768,539

• Date Filed

  Not available

• Date Issued

  Tuesday, July 1, 1930
  94 years ago

• CPC

  • B61L3/185 - using separate conductors

• US Classifications

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