A shutter that can open and close {HEAD ~ the air discharge port} is mounted on {TAIL ~ a case} 
A shutter that can open and close { HEAD ~ the air discharge port } is mounted on { TAIL ~ a case }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL