1
Vanni Poletto: Switching voltage regulator for an interface circuit in a telephone subscriber line. SGS Thomson Microelectronics S r l, Rosen Dainow & Jacobs, March 13, 1990: US04908856 (14 worldwide citation)

A so-called switching voltage regulator for an interface circuit in a telephone subscriber line, being of a type adapted to control the on/off states of an electronic switch, connected to the interface circuit and consisting of first and second transistors interconnected into a Darlington arrangemen ...


2
Poletto Vanni: A so-called switching voltage regulator for an interface circuit in a telephone subscriber line.. Sgs Thomson Microelectronics, September 28, 1988: EP0284571-A2

A so-called switching voltage regulator (1) for an interface circuit (16) in a telephone subscriber line, being of a type adapted to control the on/off states of an electronic switch (SW), connected to the interface circuit (16) and consisting of first (T1) and second (T2) transistors interconnected ...