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DIN 7643 [Withdrawn] referenced in following documents:

Document number Edition Title
DIN 73358-3 1988-09 Fuel filters for compression ignition engines; form B; head connections More 
DIN 7601 1998-02 Compression couplings with ball-type nipples - Complete unions and survey More 
DIN 7642 1997-07 Compression couplings - Ring type nipples for brazed connection More