Finally, the protective coating 13 is applied to the surface of the filter as the last layer, and once again the peripheral region is kept free in {HEAD ~ order} to form {TAIL ~ the contact bank} 8 
to form
Finally , the protective coating 13 is applied to the surface of the filter as the last layer , and once again the peripheral region is kept free in { HEAD ~ order } to form { TAIL ~ the contact bank } 8
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 HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH