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US5401283A Ultra-hard abrasive particles 失效
超硬磨粒

Ultra-hard abrasive particles
摘要:
A synthetic diamond or cubic boron nitride particle is characterized by containing two or more stable isotopes of an element present in a ratio which is different to the ratio in which the isotopes exist in nature. The diamond or cubic boron nitride particle thus has a fingerprint. A preferred example of the element is nitrogen.
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