Improvements in the construction of sliding shovel excavators on a rigid guide, particularly suitable for frontal excavations of vertical walls (Machine-translation by Google Translate, not legally binding)
DE1634802A1
Excavator equipment for digging trenches and shafts
ES249712A1
Improvements in or relating to bucket excavators
CA676448A
Rigid-guide excavator particularly adapted for the digging of trenches with vertical walls
CA642980A
Bucket excavator slidable on rigid guide particularly for frontal digging at vertical walls
