{TAIL ~ The present invention} relates to an apparatus for manufacturing a core soot in a step for manufacturing an porous optical fiber soot according to a VAD method, and to a method for manufacturing of {HEAD ~ a core soot} using the apparatus 
{ TAIL ~ The present invention } relates to an apparatus for manufacturing a core soot in a step for manufacturing an porous optical fiber soot according to a VAD method , and to a method for manufacturing of { HEAD ~ a core soot } using the apparatus
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