Patent ID: 7280017

Claim:
A secure magnetic sensor comprising: a first magnetically activatable sensor having a first magnetically attracting member operable in one of two modes, a first mode wherein said sensor is in an open position, and a second mode wherein in the presence of a first magnetic field, said first magnetically attracting member moves in a first direction to a closed position; a second magnetically activatable sensor positioned substantially adjacent to said first magnetically activatable sensor in the first direction, said second magnetically activatable sensor having a second magnetically attracting member operable in one of two mode, a first mode wherein said sensor even in the presence of the first magnetic field remains in a closed position, and a second mode wherein in the presence of the first magnetic field and a supplemental magnetic field, said second magnetically attracting member moves substantially in the first direction to an open position; and wherein said first magnetically activatable sensor is electrically connected in series to said first magnetically activatable sensor.