The sensor apparatus includes {HEAD ~ first and second substantially non compliant force translation plates} disposed in a seat in an orientation that is generally parallel to the seating surface of the seat, {TAIL ~ an elastomeric mat} disposed between the first and second force translation plates, and a switch mechanism disposed in an opening in the elastomeric mat 
The sensor apparatus includes { HEAD ~ first and second substantially non compliant force translation plates } disposed in a seat in an orientation that is generally parallel to the seating surface of the seat , { TAIL ~ an elastomeric mat } disposed between the first and second force translation plates , and a switch mechanism disposed in an opening in the elastomeric mat
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