In step 10 a, {TAIL ~ the print head unit} 10 is mounted to {HEAD ~ an ink jet device} 
In step 10 a , { TAIL ~ the print head unit } 10 is mounted to { HEAD ~ an ink jet device }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD