Balz Knabenhans

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Ennetburgen, CH

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Patents Grantslast 30 patents

Information Patent Grant
Hearing device for a protective helmet
- Patent number 5,073,947
- Issue date Dec 17, 1991
- Dragerwerk AG
- Hans Reddemann
- A42 - HEADWEAR
Information Patent Grant
Supportive fastening means for a protective helmet
- Patent number 4,890,338
- Issue date Jan 2, 1990
- Dragerwerk Aktiengesellschaft
- Balz Knabenhans
- A42 - HEADWEAR