Additionally, {TAIL ~ the housing} 12 includes an inlet 15 for receiving {HEAD ~ an assist gas}, which is typically air 
Additionally , { TAIL ~ the housing } 12 includes an inlet 15 for receiving { HEAD ~ an assist gas } , which is typically air
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH