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from at least partially schraubenlinienförmigen, preformed elements formed hilfskörper,process for the production of a shell for a body of plastic hilfskörpers and use the hilfskörpers
from at least partially schraubenlinienförmigen, preformed elements formed hilfskörper,process for the production of a shell for a body of plastic hilfskörpers and use the hilfskörpers
