Coal mining machine cuts swath wider than itself and cuts entry passages into coal seam in one pass.
Miner for Cutting Entry Passages in Coal Seams
NASA Tech Briefs ; 8 , 1
1984-04-01
Miscellaneous
No indication
English
Bidirectional Continuous Coal Miner
NTRS | 1984
|Stripping coal from four seams
Engineering Index Backfile | 1960
|Enhancing continous miner flexibility
Tema Archive | 1994
|