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