1378389

Information

• Patent Grant
• 1378389

• References
• Source

• Patent Number

  1,378,389

• Date Filed

  Not available

• Date Issued

  Tuesday, May 17, 1921
  104 years ago

• CPC

  • B61L3/065 - controlling optically

• US Classifications

  • 246 - Railway switches and signals
  • 091 - Motors: expansible chamber type
  • 250 - Radiant energy