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This document replaces DIN 21538-1:1990-05 , DIN 21538-2:1990-05 , DIN 21539:1988-01 , DIN 21541:1991-04 , DIN 21542-1:1989-04 , DIN 21542-2:1989-04 , DIN 21544:1990-07 , DIN 21545:1991-03 , DIN 21547:1988-01 , DIN 21552:1991-04 , DIN 21554:1989-07 .
This document has been replaced by: DIN 21530-4:2016-09 .