2202474

Information

• Patent Grant
• 2202474

• References
• Source

• Patent Number

  2,202,474

• Date Filed

  Not available

• Date Issued

  Tuesday, May 28, 1940
  84 years ago

• CPC

  • H04J1/14 - Arrangements providing for calling or supervisory signals
  • H04Q5/02 - with direct connection for all subscribers
  • H04Q5/08 - Signalling by continuous ac

• US Classifications

  • 370 - Multiplex communications
  • 379 - Telephonic communications