{HEAD ~ A pump} 1, wherein {TAIL ~ the sheet} is in the shape of a substantially spherical or conical cap complementary to the inside surface of the side plate so as to fit against it as closely as possible, with the convex side of this shape facing towards the inside of the chamber 
{ HEAD ~ A pump } 1 , wherein { TAIL ~ the sheet } is in the shape of a substantially spherical or conical cap complementary to the inside surface of the side plate so as to fit against it as closely as possible , with the convex side of this shape facing towards the inside of the chamber
HEAD HEAD HEAD HEAD HEAD HEAD OTH 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 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