2857466

Information

• Patent Grant
• 2857466

• References
• Source

• Patent Number

  2,857,466

• Date Filed

  Not available

• Date Issued

  Tuesday, October 21, 1958
  66 years ago

• CPC

  • H04Q3/525 - using tubes in the switching stages
  • H04Q3/00 - Selecting arrangements

• US Classifications

  • 340 - Communications: electrical
  • 379 - Telephonic communications