https://patents.google.com/patent/CN101629656A/en
CN101629656A - Underground polyvinyl chloride tubing for coal mines - Google Patents
The invention provides underground polyvinyl chloride (PVC) tubing for coal mines, which is formed by adding a proper amount of promoter to PVC resin as the...
polyvinyl chloride tubingcoal minesundergroundgooglepatents
https://uk.rs-online.com/web/p/hose-pipe-flexible-tubes/1369497
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