DEVICE FOR SHAPING TUBES FROM CONCRETE MORTARS BY ROLLING-OVER von KHEJFITS IGOR BORISOVICH,SU, EPSHTEJN LEV ISAAKOVICH,SU, GORSHKOV ALEKSEJ MATVEEVICH,SU, OSIPOV ALEKSEJ PAVLOVICH,SU, SHISHKIN ALEKSANDR STEPANOVICH,SU, KHAIT YURIJ GRIGOREVICH,SU

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