| 20090042491 | METHOD AND APPARATUS FOR CIRCUMFERENTIAL INTERIOR TREATMENT OF PIPE ELBOWS - A method for the circumferential interior treatment of pipe elbows, including a step of positioning a working member within a pipe elbow and moving the working member along a portion of a length of the pipe elbow between selected working positions, while concurrently manipulating the pitch and rotational positioning of the pipe elbow to maintain a concentric rotation of the pipe elbow about the working member. | 02-12-2009 |
