1
Roger Christ: Method and apparatus for tracking and locating personnel. Dominion Wireless, Kenyon & Kenyon, November 2, 1999: US05977913 (340 worldwide citation)

To locate a person within a particular room inside a building or, if outside, within a small enough radius that enables a rapid identification of where that person is located, a system of sensors is strategically disposed throughout the building or area. The sensors are calibrated so that upon activ ...


2
Christ Roger: Methode et appareil concus pour reperer et localiser du personnel, Method and apparatus for tracking and locating personnel. Dominion Wireless, Magal Senstar, RIDOUT & MAYBEE, March 30, 2004: CA2225638

To locate a person within a particular room inside a building or, if outside, within a small enough radius that enables a rapid identification of where that person is located, a system of sensors is strategically disposed throughout the building or area. The sensors are calibrated so that upon activ ...