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“缺口”线轴 / The defective spool


We may have difficulties in finding the end of a thread while sewing ."The defective spool" has two wedge holes .After finishing sewing,we make the end of the thread through them .Then we ccan find it easily next time.


Nanchang University

Nanchang University
NanChang, China

heqi zhao,
Nanchang university

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