The device structure allows the display to be easily visible by the user and {HEAD ~ insertion} of {TAIL ~ the cartridge} is easily accessible and visible during use 
of
The device structure allows the display to be easily visible by the user and { HEAD ~ insertion } of { TAIL ~ the cartridge } is easily accessible and visible during use
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH