E21D 21/002
Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
Official title: {using explosives charges}
E21D21/002 (Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection) appears on 3 US grants and 2 published applications in this corpus.
Search patents in E21D- Granted patents
- 3
- Published applications
- 2
- Assignees
- 4
- Inventors
- 13
- Latest grant
- 15 Jul 1997
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| 2025 | 0 | 1 |
By publication year. Applications have been published since 2001.
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