Pipeline shutoff valves. Gate valve seal classes and standards
Арматура трубопроводная запорная. Классы и нормы герметичности затворов. |
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MinNR 788On approval of the procedure for issuing and … |
GOST 15150-69Machinery, instruments, and other technical … |
SP 14.13330.2011Construction in Seismic Areas Updated Version … |