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https://www.uspto.gov/web/patents/classification/cpc/html/defC21C.html

CPC Definition - C21C PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL...

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https://sinoninetech.com/

Manufacture and sell flotation machine,ball mill,mineral processing equipment

Manufactures and sells flotation machine,ball mill, mineral processing equipment

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https://www.nist.gov/publications/health-dangers-during-manufacture-processing-and-decomposition-synthetic-products

Health dangers during the manufacture processing and decomposition of synthetic products: | NIST

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