2201358

Information

• Patent Grant
• 2201358

• References
• Source

• Patent Number

  2,201,358

• Date Filed

  Not available

• Date Issued

  Tuesday, May 21, 1940
  84 years ago

• CPC

  • H04Q5/20 - the subordinate centre permitting interconnection of subscribers connected thereto
  • H04M3/60 - Semi-automatic systems

• US Classifications

  • 379 - Telephonic communications