Hochstrasser geb. Wack; Elisabeth

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Drilling device
- Patent number 4,526,242
- Issue date Jul 2, 1985
- Hochstrasser geb. Wack; Elisabeth
- Hans Mathieu
- E21 - EARTH DRILLING MINING
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Device for the control of the internal pressure in a drill pipe for...
- Patent number 4,295,759
- Issue date Oct 20, 1981
- Hochstrasser geb. Wack; Elisabeth
- Hans Mathieu
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING

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