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