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