(under subclass 120) Apparatus wherein a plurality of balls or cylinders is provided between the track and the frame to facilitate movement about the frame.
SEE OR SEARCH CLASS
111, Planting,
42, for an endless belt tripped hill-planting machine.
198, Conveyors: Power-Driven,
814, for a spring biasing device for tensioning an endless conveyor belt; subclass 842 for a rotatable support, guide, or holddown means for a conveyor belt. [figure] [caption]A, B, C - Frame; D - Track rollers; E - Ground engaging roller; F - Spacer; G - Axle; H, J - Axle heads
