The overhead traveling vehicles travel along a travel rail provided near {HEAD ~ a ceiling}, and the number of {TAIL ~ the overhead traveling vehicles} is, e.g., more than one hundred 
The overhead traveling vehicles travel along a travel rail provided near { HEAD ~ a ceiling } , and the number of { TAIL ~ the overhead traveling vehicles } is , e.g. , more than one hundred
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH