Emergency leaking stoppage teaching aid
ZHAO ZHIGANG, GUO YONGBING, NIU YASHI, WANG XIZHI, HU YIWEI, PAN WANNIAN, ZHAI FUDONG
Year of Publication 10.11.2020
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Year of Publication 10.11.2020
Patent
Emergency leaking stoppage teaching aid
ZHAO ZHIGANG, GUO YONGBING, NIU YASHI, WANG XIZHI, HU YIWEI, PAN WANNIAN, ZHAI FUDONG
Year of Publication 28.07.2020
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Year of Publication 28.07.2020
Patent