Pipeline shutoff valves. Standards for seal tightness
Арматура трубопроводная запорная. Нормы герметичности затворов. |
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FATRM 20On approval of the “Gas certification system |
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KZ СТ РК 1.0-2006State technical regulation system of the … |
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GOST 21924.3-84Reinforced concrete slabs for pavement of city … |