An assembly which can be inserted into a pipeline or passageway on which a curable resin impregnated flexible lining is placed about an inflatable bladder is provided. The bladder is mounted to one end of a core pipe and folded over on itself. Medium flowing in the pipeliner passageway can pass through...http://www.google.com/patents/US5706861?utm_source=gb-gplus-sharePatent US5706861 - Rehabilitation of pipelines and passageways with a flexible liner using an inflatible bladder 
