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