JJloper a New 6-ft. hydraulic bank sloper, designated Model HBS-D6, designed for use on Caterpillar D6 crawler tractors ... for first time three fully hydraulic power-telescoping sections . . . main boom requires no pinned manual extensions . . . extends hy- ... M-2030R rear dump rocker is designed for Michigan 210 tractor, M- 2740R rear dump rocker for Michigan 310 III ... new- model loader backhoes, designated 480, 580 and 680, have been added to J. I. Case Construction King line .