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DIN EN 1759-3 [CURRENT] referenced in following documents:

Document number Edition Title
VDI 2200 2007-06 Tight flange connections - Selection, calculation, design and assembly of bolted flange connections More 
DIN 11869 2016-08 Flow sight glass More 
DIN EN 1349 ; VDE 0409-1349:2010-01 2010-01 Industrial process control valves; German version EN 1349:2009 More