APPARATUS FOR PRODUCING HELICAL SEAM TUBES von SHPIGELMAN RUDOLF M,SU, SHIPILOV ALEKSANDR I,SU, BELYAKOV ALEKSANDR I,SU, KAMELYANOV TIMUR S,SU, ISAEV IVAN N,SU, BULYGIN ANATOLIJ D,SU, ORLOV VLADIMIR I,SU, SIDORKEVICH MIKHAIL A,SU

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