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Study on modification and functional properties of ebonite .

硬质橡胶的改性与功能化研究。

Ebonite fixed wide wheel industrial caster .

硬橡胶固定肥仔轮。

Always obliging in their quest to satisfy the needs of musicians , the company completed and released their hand-made ebonite and metal mouthpieces in december 1972 .

一直在寻求迫使满足音乐家的需求，该公司完成并公布其在1972年12月手工制作的硬质橡胶和金属喉舌。