{HEAD ~ Apparatus} 1, wherein {TAIL ~ the device} is provided with means which follows its rotation and is capable of shearing the vitrifiable material 
wherein
{ HEAD ~ Apparatus } 1 , wherein { TAIL ~ the device } is provided with means which follows its rotation and is capable of shearing the vitrifiable material
HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH