BS 4504 BLANK FLANGE, BLIIND FLANGE RAISED FACE PN6, PN10, PN16, PN25, PN40 British Standard BS 4504: Ntu 3.1: 1989 - Lub voj voog Flanges rau cov kav dej, Valves thiab Fittings (PN Designated), SpecificationsQhov no suav nrog flanges hauv nominal siab ntau yam PN 2.5 txog PN 40 thiab n...
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