1681977

Information

• Patent Grant
• 1681977

• References
• Source

• Patent Number

  1,681,977

• Date Filed

  Not available

• Date Issued

  Tuesday, August 28, 1928
  96 years ago

• CPC

  • B61L17/023 - Signalling; Signals with multiple indicating means

• US Classifications

  • 104 - Railways
  • 246 - Railway switches and signals