1
Han L Song: Vehicle locating and navigating system. Lerner David Littenberg Krumholz & Mentlik, May 4, 1993: US05208756 (478 worldwide citation)

A vehicle locating and navigating system operating in conjunction with a cellular telephone network is provided. A small, hidden device located in a vehicle is activated through DTMF signals transmitted from any telephone station. Upon activation, the device determines the power at which normally tr ...


2
Song Han Lee: Vehicle locating and navigating system. Song Han Lee, LITTENBERG Joseph S, August 6, 1992: WO/1992/013284

A vehicle locating and navigating system operating in conjunction with a cellular telephone network (2) is provided. A small, hidden device (19) located in a vehicle (1) is activated through DTMF signals transmitted from any telephone station (16, 18, 20). Upon activation, the device (19) determines ...