The apparatus 4, wherein the projecting part is integrally formed with {HEAD ~ a main body} of {TAIL ~ the mask} 
The apparatus 4 , wherein the projecting part is integrally formed with { HEAD ~ a main body } of { TAIL ~ the mask }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL