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still for framstellning of polymers which have the law permeability for gases based on a kernel of acrylonitrile and / or meatkrylnitril and acrylate or methacrylate graft with butadiene
still for framstellning of polymers which have the law permeability for gases based on a kernel of acrylonitrile and / or meatkrylnitril and acrylate or methacrylate graft with butadiene