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Safety door

by JIANG CHANGYOU
Year of Publication 29.11.2019
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Patent

Glass door

by JIANG CHANGYOU
Year of Publication 29.11.2019
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Patent

Quick coupling

by JIANG CHANGYOU
Year of Publication 19.01.2011
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Patent

Quick coupling

by CHANGYOU JIANG
Year of Publication 22.12.2010
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Patent