277 / | HD | SEAL FOR A JOINT OR JUNCTURE |
345 | DF | SEAL BETWEEN RELATIVELY MOVABLE PARTS (I.E., DYNAMIC SEAL) {10} |
434 | DF | .~ Piston ring or piston ring expander or seat therefor {15} |
458 | .~.~ Piston ring having single piece noncircular or multiturn (e.g., helical, spiral, oblong, elliptical, polygonal, etc.) shape |