{HEAD ~ The present invention} includes {TAIL ~ a mattress} having a fluid based center portion encapsulated by a stablizing visco elastic polyurethane covering adapted to prevent lateral or longitudinal movement while a patient is disposed thereon 
includes
{ HEAD ~ The present invention } includes { TAIL ~ a mattress } having a fluid based center portion encapsulated by a stablizing visco elastic polyurethane covering adapted to prevent lateral or longitudinal movement while a patient is disposed thereon
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