The aluminium foil membrane may alternatively be reinforced by {HEAD ~ a grid structure} inside {TAIL ~ the chamber} and across the inlet thereto 
inside
The aluminium foil membrane may alternatively be reinforced by { HEAD ~ a grid structure } inside { TAIL ~ the chamber } and across the inlet thereto
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH