{HEAD ~ a flexible diaphragm} sealed over {TAIL ~ the open mouth} of the housing to define a plenum between the walls of the mouth in the housing and the diaphragm, and wherein the inlet formed in the housing is in communication with the plenum 
sealed over
{ HEAD ~ a flexible diaphragm } sealed over { TAIL ~ the open mouth } of the housing to define a plenum between the walls of the mouth in the housing and the diaphragm , and wherein the inlet formed in the housing is in communication with the plenum
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH