2939111

Information

• Patent Grant
• 2939111

• References
• Source

• Patent Number

  2,939,111

• Date Filed

  Not available

• Date Issued

  Tuesday, May 31, 1960
  64 years ago

• CPC

  • H04Q9/14 - Calling by using pulses
  • B61L21/06 - Vehicle-on-line indication Monitoring locking and release of the route

• US Classifications

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