Patents Assigned to Telstop S.A.
  • System for monitoring dialled telephone numbers
    Patent number: 4013839
    Abstract: A system for monitoring dialled numbers is disclosed which provides a subscriber with a record of numbers dialled over his telephone line or lines. The system provides a monitoring unit inductively coupled to each line which tapes the dial pulses as they are dialled. Aslo included is a control processing unit which processes the individual tapes to provide a written record. The system thus eliminates the need for duplicating costly equipment such as discriminators and printers at each line.
    Type: Grant
    Filed: November 8, 1974
    Date of Patent: March 22, 1977
    Assignee: Telstop S.A.
    Inventor: Arthur Stewart Bell