Referring to FIG 1, {TAIL ~ the outer fins} 2 can be rolled by one time forming on outside wall of {HEAD ~ a tube body} 1 with inner fins 17 to manufacture an enhanced heat transfer tube 
Referring to FIG 1 , { TAIL ~ the outer fins } 2 can be rolled by one time forming on outside wall of { HEAD ~ a tube body } 1 with inner fins 17 to manufacture an enhanced heat transfer tube
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH