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DIN 28124-1 [CURRENT] references following documents:

Document number Edition Title
DIN 28125-1 2020-04 Hinged closures, round - Part 1: Nominal diameter DN 150 to DN 800 More 
DIN 28125-4 2020-04 Hinged closures, round - Part 4: Light version, nominal diameter DN 150 to DN 800 More