3840703

Information

• Patent Grant
• 3840703

• References
• Source

• Patent Number

  3,840,703

• Date Filed

  Not available

• Date Issued

  Tuesday, October 8, 1974
  50 years ago

• CPC

  • H04Q5/02 - with direct connection for all subscribers
  • H04M19/08 - Current supply source at substation

• US Classifications

  • 370 - Multiplex communications
  • 379 - Telephonic communications