In the preferred embodiment, {HEAD ~ said air flow} is supplied through {TAIL ~ a tube} which is mounted at or near said carriage assembly 
is supplied through
In the preferred embodiment , { HEAD ~ said air flow } is supplied through { TAIL ~ a tube } which is mounted at or near said carriage assembly
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH