In the figure, the electronic components 17 to be treated at {TAIL ~ each work process} are indicated with {HEAD ~ the solid black boxes} for the viewing convenience 
In the figure , the electronic components 17 to be treated at { TAIL ~ each work process } are indicated with { HEAD ~ the solid black boxes } for the viewing convenience
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH