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