3789151

Information

• Patent Grant
• 3789151

• References
• Source

• Patent Number

  3,789,151

• Date Filed

  Not available

• Date Issued

  Tuesday, January 29, 1974
  50 years ago

• CPC

  • H04Q3/521 - using semiconductors in the switching stages
  • H03K17/6221 - combined with selecting means

• US Classifications

  • 379 - Telephonic communications
  • 340 - Communications: electrical