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