Apparatus for manufacturing {HEAD ~ an optical fiber soot}, and {TAIL ~ method} for manufacturing an optical fiber soot using thereof 
Apparatus for manufacturing { HEAD ~ an optical fiber soot } , and { TAIL ~ method } for manufacturing an optical fiber soot using thereof
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH