E21C 27/18
Machines which completely free the mineral from the seam: by both slitting
Official title: by both slitting and planing
E21C27/18 (Machines which completely free the mineral from the seam: by both slitting) appears on 1 US grants and 0 published applications in this corpus.
Search patents in E21C- Granted patents
- 1
- Published applications
- 0
- Assignees
- 1
- Inventors
- 2
- Latest grant
- 6 Jan 1981
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| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
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