2688659

Information

• Patent Grant
• 2688659

• References
• Source

• Patent Number

  2,688,659

• Date Filed

  Not available

• Date Issued

  Tuesday, September 7, 1954
  70 years ago

• CPC

  • H04Q1/18 - Electrical details

• US Classifications

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