According to an alternate aspect of the present invention, {HEAD ~ a sensor} is provided that can detect {TAIL ~ changes} in gravitational and inertial acceleration 
detect
According to an alternate aspect of the present invention , { HEAD ~ a sensor } is provided that can detect { TAIL ~ changes } in gravitational and inertial acceleration
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH