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Roof Support Near Coal-Mining FaceHydraulically-powered legs mounted on crawlers and carrying sections of conveyors provide roof support close to working face and above workspace at all times.
Document ID
19830000431
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Knurovsky, T. (Caltech)
Kiskis, J. P. (Caltech)
Siegel, G. (Caltech)
Date Acquired
August 11, 2013
Publication Date
April 1, 1984
Publication Information
Publication: NASA Tech Briefs
Volume: 8
Issue: 1
ISSN: 0145-319X
Subject Category
Machinery
Report/Patent Number
NPO-15165
Accession Number
83B10431
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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