2721233

Information

• Patent Grant
• 2721233

• References
• Source

• Patent Number

  2,721,233

• Date Filed

  Not available

• Date Issued

  Tuesday, October 18, 1955
  69 years ago

• CPC

  • H04Q3/0012 - in which the relays are arranged in a matrix configuration
  • H01H63/36 - Circuit arrangements for ensuring correct or desired operation and not adapted to a particular application of the selector switch

• US Classifications

  • 379 - Telephonic communications
  • 361 - Electricity: electrical systems and devices