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This document replaces DIN 55171-1:1961-10 , DIN 55171-2:1961-10 , DIN 55172:1961-10 , DIN 55173-1:1961-10 , DIN 55173-2:1961-10 , DIN 55174:1961-10 , DIN 55178:1961-10 , DIN 55179:1961-10 , DIN 55180:1961-10 .