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.
Compact Hydraulic Excavator and Support Unit
NASA Tech Briefs ; 9 , 2
1985-10-01
Miscellaneous
No indication
English
Tooth-type structure of support chain wheel of hydraulic excavator and hydraulic excavator
European Patent Office | 2015
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