Hemptwist or overedging paper mechanism can be added.
可加麻绳机构，包边纸机构。
The paper talks about the theory on transforming single needle sewing machine into overedging machine.
简述单针缝纫机改造成包边机的原理。
The paper talks about the theory on transforming single needle sewing machine into overedging machine.
简述单针缝纫机改造成包边机的原理。
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