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