Dietrich Willuhn

Follow

Person

Troisdorf, DE

People

Patents Grantslast 30 patents

Information Patent Grant
Yieldable roof support for mine passages and the like
- Patent number 4,443,134
- Issue date Apr 17, 1984
- Klockner-Werke Aktiengesellschaft
- Reinhold Gross
- E21 - EARTH DRILLING MINING