2581697

Information

• Patent Grant
• 2581697

• References
• Source

• Patent Number

  2,581,697

• Date Filed

  Not available

• Date Issued

  Tuesday, January 8, 1952
  73 years ago

• CPC

  • H04M15/36 - Charging, billing or metering arrangements for party-lines
  • H04M1/54 - Arrangements wherein a dial or equivalent generates identifying signals
  • H04M9/002 - with subscriber controlled access to a line
  • H04Q5/02 - with direct connection for all subscribers

• US Classifications

  • 379 - Telephonic communications