2200593

Information

• Patent Grant
• 2200593

• References
• Source

• Patent Number

  2,200,593

• Date Filed

  Not available

• Date Issued

  Tuesday, May 14, 1940
  84 years ago

• CPC

  • H04M3/60 - Semi-automatic systems
  • H04M5/08 - using connecting means other than cords

• US Classifications

  • 379 - Telephonic communications