The coiled spring is disposed swingably outside the first intake air passage or the second intake air passage, and has {HEAD ~ a swinging end}, which is brought into {TAIL ~ contact} with a surface of the interlocking member 
is brought into
The coiled spring is disposed swingably outside the first intake air passage or the second intake air passage , and has { HEAD ~ a swinging end } , which is brought into { TAIL ~ contact } with a surface of the interlocking member
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 HEAD HEAD OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH