285 / | HD | PIPE JOINTS OR COUPLINGS |
120.1 | HAVING PLURAL INDEPENDENT PATHS {4} | |
121.1 | DF | .~> Allowing relative motion of pipes {3} |
122.1 | DF | .~> And at least one path having branched flow |
123.1 | DF | .~> For concentric tubes or pipes (e.g., well casing or wellhead type) {4} |
124.1 | DF | .~> Parallel paths {2} |