| 285 / | HD | PIPE JOINTS OR COUPLINGS |
| 120.1 | DF | HAVING PLURAL INDEPENDENT PATHS {4} |
| 123.1 | DF | .~ For concentric tubes or pipes (e.g., well casing or wellhead type) {4} |
| 123.3 | DF | .~.~ Having single suspended inner tube {3} |
| 123.5 | DF | .~.~.~ Having inner tube anchored by slip means {2} |
| 123.6 | | .~.~.~.~ Including packing means {2} |
| 123.7 | DF | .~.~.~.~.~> Having means engaging slip means and compressing packing means {1} |
| 123.9 | DF | .~.~.~.~.~> Having radially applied orienting means |