DIN EN 640:1994 Reinforced concrete pressure pipes and distributed reinforcement concrete pressure pipes (non-cylinder type), including joints and fittings; German version EN 640:1994
1994DIN EN 640:1994-12 Reinforced concrete pressure pipes and distributed reinforcement concrete pressure pipes (non-cylinder type), including joints and fittings; German version EN 640:1994
1994DIN EN 640:1994 Reinforced concrete pressure pipes and distributed reinforcement concrete pressure pipes (non-cylinder type), including joints and fittings; German version EN 640:1994