Patent
Magnetically attracted bobbins
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TLDR
Disposable magnetically affected sewing bobbins formed of paper or plastic impregnated or coated with particulate iron powder or other magnetically-affected material are commonly used for sewing as mentioned in this paper.Abstract:
Disposable magnetically affected sewing bobbins formed of paper or plastic impregnated or coated with particulate iron powder or other magnetically affected material.read more
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