2667540

Information

• Patent Grant
• 2667540

• References
• Source

• Patent Number

  2,667,540

• Date Filed

  Not available

• Date Issued

  Tuesday, January 26, 1954
  71 years ago

• CPC

  • H04Q1/18 - Electrical details
  • H04Q3/0004 - using crossbar selectors in the switching stages

• US Classifications

  • 379 - Telephonic communications