The graphical information may be: graphical indication of the installation locations of the optical parts; different pictorial expressions about the installation and the removal works; and {HEAD ~ graphical indication} of {TAIL ~ the identification marks} of the optical parts 
of
The graphical information may be : graphical indication of the installation locations of the optical parts ; different pictorial expressions about the installation and the removal works ; and { HEAD ~ graphical indication } of { TAIL ~ the identification marks } of the optical parts
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 HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH