2140930

Information

• Patent Grant
• 2140930

• References
• Source

• Patent Number

  2,140,930

• Date Filed

  Not available

• Date Issued

  Tuesday, December 20, 1938
  87 years ago

• CPC

  • H04M5/10 - using separate plug for each subscriber

• US Classifications

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