发明公开
EP1112233A1 METHOD OF MAKING A GLASS PREFORM 审中-公开
一种用于生产玻璃毛坯

METHOD OF MAKING A GLASS PREFORM
摘要:
A thing (32) has an aperture (10) in it. The thing is heated and drawn. The thing is heated again and drawn again. The aperture is evacuated.
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