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A Simple Key For หัวเจียรยาง Unveiled

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The English Chemist Joseph Priestley gave it the name rubber in 1770 when he observed it may be utilized to rub out pencil marks. Its main business results came only after the vulcanization procedure was invented by Charles Goodyear in 1839. This gives CR comparatively excellent weathering and heat resistance, https://beediadiamond.com/catalog/rubber-points
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