NASA NTRS · 19850000243
Compact Hydraulic Excavator and Support Unit
Abstract
Continuous-coal-mining machine maneuverable. Hydraulic coal excavator combined with chock, or roof-support structure, in self-contained unit that moves itself forward as it removes coal from seam. Unlike previous such units, new machine compact enough to be easily maneuverable; even makes small-radius right-angle turns.
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Lewis, E. V.. 1985-10-01. Compact Hydraulic Excavator and Support Unit. https://ntrs.nasa.gov/citations/19850000243
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