Non-standard 250.83 mm buttress screw-thread casing-pipe joint von SHUANLU,LUO LV

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Non-standard 250.83 mm buttress thread casing-pipe joint gauge von SHUANLU,LUO LV

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Double-shoulder gas-sealing threaded joint for casing tube with tube outer diameter of 200.03mm von WANG YALAN, LV SHUANLU

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Nonstandard 187.33mm NC53 drill threaded connector gauge von WANG YALAN, KANG YANJUN, LU QIANG, LV SHUANLU, LUO FAQIAN

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Non-standard 365.13mm buttress thread connector gauge von AN WENHUA, YANG CHENGXIN, DING YI, TENG XUEQING, LIU DEYING, LONG PING, WANG CHUNSHENG, XU ZHIXIONG, LI NING, ZHANG HUABEI, QIN HONGDE, WEN ZHIMING, LV SHUANLU, GUO WENMENG, SHAN YONGLIN, LI XIAOCHUN, LE FAGUO

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Nonstandard 365.13 mm buttress thread sleeve pipe connector von AN WENHUA, YANG CHENGXIN, DING YI, TENG XUEQING, LIU DEYING, LONG PING, XU ZHIXIONG, WANG CHUNSHENG, LI NING, ZHANG HUABEI, QIN HONGDE, WEN ZHIMING, LV SHUANLU, GUO WENMENG, LI XIAOCHUN, LE FAGUO

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Hermetic seal sleeve pipe screwed joint with pipe external diameter 200.03mm von CHI JUN, AN WENHUA, YANG CHENGXIN, DING YI, TENG XUEQING, LONG PING, WANG YALAN, ZHANG YAOMING, LV SHUANLU, LUO FAQIAN, KANG YANJUN, ZHANG XINPING, LI HUAIZHONG

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