1972941

Information

• Patent Grant
• 1972941

• References
• Source

• Patent Number

  1,972,941

• Date Filed

  Not available

• Date Issued

  Tuesday, September 11, 1934
  90 years ago

• CPC

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

• US Classifications

  • 340 - Communications: electrical
  • 246 - Railway switches and signals