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Filter mud valve

by Xu Shanping
Year of Publication 17.08.2016
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Patent

Bellows stop valve

by Xu Shanping
Year of Publication 17.08.2016
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Patent

Floating ball valve

by Xu Shanping
Year of Publication 17.08.2016
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Patent

Y -shaped filter

by Xu Shanping
Year of Publication 17.08.2016
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Patent