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หัวเจียรยาง - An Overview

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The English Chemist Joseph Priestley gave it the title rubber in 1770 when he identified it could be utilized to rub out pencil marks. Its key industrial good results came only following the vulcanization method was invented by Charles Goodyear in 1839. Ethylene Propylene Rubber (EPM) is really a copolymer https://beediadiamond.com/catalog/rubber-points
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