It is therefore an object of this invention to provide {HEAD ~ a device} that relieves {TAIL ~ the stress} on the back and buttocks when the user is sitting in a chair to which the device has been attached 
relieves
It is therefore an object of this invention to provide { HEAD ~ a device } that relieves { TAIL ~ the stress } on the back and buttocks when the user is sitting in a chair to which the device has been attached
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH