a holder configured to be mounted to the first housing, the holder having a first mating part corresponding to the first engagement part, the holder having a second engagement part for {HEAD ~ engagement} of the first engagement part and {TAIL ~ the first mating part} 
of
a holder configured to be mounted to the first housing , the holder having a first mating part corresponding to the first engagement part , the holder having a second engagement part for { HEAD ~ engagement } of the first engagement part and { TAIL ~ the first mating part }
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 OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL