Boṣewa Flange: Standard GB/T9115-2000, Ministry of Machinery STANDARD JB82-94, Ministry of Chemical Industry standard HG20595-97HG20617-97, Ministry of Electric Power standard GD0508 ~ 0509, American boṣewa ASME/ANSI B16.5, Japanese bošewa JIS/KS(5K, 10K, 16K, 20K), boṣewa German...
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