dfygj 发表于 2019-12-16 08:40:28

BS 1414-1975 Specification forSteel wedge gate valves (flanged andbutt-welding e

Specification forSteel wedge gate valves (flanged andbutt-welding ends) for the petroleum, petrochemical and allied industries

admin 发表于 2019-12-29 20:00:08

谢谢您的分享，金币已奖励！
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