driving means provided inside said hermetically sealed container for expanding {TAIL ~ said pressure} transmitting {HEAD ~ medium} 
driving means provided inside said hermetically sealed container for expanding { TAIL ~ said pressure } transmitting { HEAD ~ medium }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD