2623951

Information

• Patent Grant
• 2623951

• References
• Source

• Patent Number

  2,623,951

• Date Filed

  Not available

• Date Issued

  Tuesday, December 30, 1952
  72 years ago

• CPC

  • H04Q1/4465 - the same frequency being used for all signalling information
  • B24B7/08 - having an abrasive wheel built in
  • H04Q3/00 - Selecting arrangements
  • H04Q3/0016 - Arrangements providing connection between exchanges

• US Classifications

  • 379 - Telephonic communications