172 / | HD | EARTH WORKING |
518 | DF | ROLLING, ROTATING OR ORBITALLY MOVING TOOL {30} |
540 | DF | .~ Tool has circumferentially spaced teeth, tines, blades or the like {13} |
552 | DF | .~.~ Laterally extending bar or blade with skeleton support (e.g., lawn mower type, etc.) {1} |
553 | .~.~.~ Toothed bar or blade |