1731127

Information

• Patent Grant
• 1731127

• References
• Source

• Patent Number

  1,731,127

• Date Filed

  Not available

• Date Issued

  Tuesday, October 8, 1929
  95 years ago

• CPC

  • B61L3/065 - controlling optically

• US Classifications

  • 246 - Railway switches and signals
  • 250 - Radiant energy
  • 340 - Communications: electrical