Two-leg longwall shield mechanics
| Image |  |
|---|---|
| Description | report of investigations published in 1989 |
| Author/s |
author: Thomas M. Barczak |
| Publication date | January 1, 1989 |
| Language | English |
| Country of origin | |
| Wikipedia link | |
| Copyright status | |
| Missing/wrong data? | Edit Wikidata item |