2939112

Information

• Patent Grant
• 2939112

• References
• Source

• Patent Number

  2,939,112

• Date Filed

  Not available

• Date Issued

  Tuesday, May 31, 1960
  64 years ago

• CPC

  • H04Q3/525 - using tubes in the switching stages

• US Classifications

  • 340 - Communications: electrical
  • 327 - Miscellaneous active electrical nonlinear devices, circuits, and systems
  • 379 - Telephonic communications