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Walter Weirich
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Dortmund, DT
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last 30 patents
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Patent Grant
Pressure-relief valve devices
Patent number
4,074,695
Issue date
Feb 21, 1978
Gewerkschaft Eisenhutte Westphalia
Walter Weirich
F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information
Patent Grant
Apparatus for controlling water spraying operations in mineral mines
Patent number
4,068,893
Issue date
Jan 17, 1978
Gewerkschaft Eisenhutte Westfalia
Walter Weirich
E21 - EARTH DRILLING MINING
Information
Patent Grant
Apparatus for use in controlling the tension of a chain or chains o...
Patent number
4,048,866
Issue date
Sep 20, 1977
Gewerkschaft Eisenhutte Westfalia
Walter Weirich
E21 - EARTH DRILLING MINING
Information
Patent Grant
Hydraulic control systems for use with mining apparatus
Patent number
4,046,060
Issue date
Sep 6, 1977
Gewerkschaft Eisenhutte Westfalia
Kunibert Becker
E21 - EARTH DRILLING MINING