ÖNORM EN 331:2016-03

Действует

Manually operated ball valves and closed bottom taper plug valves for gas installations for buildings

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ÖNORM EN 331:2011-09

Заменен

Manually operated ball valves and closed bottom taper plug valves for gas installations for buildings

На этот документ ссылаются

ÖNORM EN 331:2011-09

Заменен

Manually operated ball valves and closed bottom taper plug valves for gas installations for buildings