(under subclass 721) Apparatus including a member separate from the earth-working element and standard and adapted to slide over the earth to act as a shoe, runner, or depth gauge.
SEE OR SEARCH THIS CLASS, SUBCLASS:
240+, for apparatus having a wheel or runner engageable with the ground for transport only.
360, for hand-guided or propelled implements having runners.
387+, for implements provided with runners spaced from the tools and see the definition and Notes thereof for the line.
764, for tools with separate runners the tools being other than the symmetrical type.
