3927270

Information

• Patent Grant
• 3927270

• References
• Source

• Patent Number

  3,927,270

• Date Filed

  Not available

• Date Issued

  Tuesday, December 16, 1975
  49 years ago

• CPC

  • H04Q3/54 - in which the logic circuitry controlling the exchange is centralised
  • H04M15/36 - Charging, billing or metering arrangements for party-lines

• US Classifications

  • 379 - Telephonic communications