1851236

Information

• Patent Grant
• 1851236

• References
• Source

• Patent Number

  1,851,236

• Date Filed

  Not available

• Date Issued

  Tuesday, March 29, 1932
  92 years ago

• CPC

  • B61L3/065 - controlling optically

• US Classifications

  • 246 - Railway switches and signals
  • 250 - Radiant energy
  • 361 - Electricity: electrical systems and devices