2022??6??6??????????????????棬?????????????????????????????????????????????????й??????????????Resin Bonded Thin Wheels????????????????????2022??8??6???

2021??6??7????????????????????????????Grindwell Norton Limited??Carborundum Universal Limited??????????????????????й???????????????????????顣?e?????漰?????????68???μ?????2022??5??23????????????????????????????????????e???á?

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https://www.dgtr.gov.in/sites/default/files/OM%20to%20DGTR%20for%20extension.pdf