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ÖNORM EN 1804-1:2021-06
Действует
Machines for underground mines - Safety requirements for hydraulic powered roof supports - Part 1: Support units and general requirements
ÖNORM EN 1804-2:2021-06
Действует
Machines for underground mines - Safety requirements for hydraulic powered roof supports - Part 2: Power set legs and rams
ÖNORM EN 1804-3:2021-06
Действует
Machines for underground mines - Safety requirements for hydraulic powered roof supports - Part 3: Hydraulic and electro hydraulic control systems