The mechanical oscillation of {HEAD ~ the fluid} is translated to {TAIL ~ the visco elastic polyurethane covering} upon which the patient is disposed 
The mechanical oscillation of { HEAD ~ the fluid } is translated to { TAIL ~ the visco elastic polyurethane covering } upon which the patient is disposed
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH