Concentric drill steels for noise reduction of percussion drilling
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| Description | publication (OP) published in 1986 |
| Author/s |
author: Robert R. Stein |
| Publication date | January 1, 1986 |
| Language | English |
| Country of origin | |
| Wikipedia link | |
| Copyright status | |
| Missing/wrong data? | Edit Wikidata item |