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หินเจียรยาง - An Overview

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The English Chemist Joseph Priestley gave it the name rubber in 1770 when he identified it could be utilized to rub out pencil marks. Its important business accomplishment came only once the vulcanization approach was invented by Charles Goodyear in 1839. · Since it is crystallized with GC and polycrystalline https://beediadiamond.com/catalog/rubber-points
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