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Arrangement in a valve actuator
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Patent number 5,992,819
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Issue date Nov 30, 1999
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ABB Research Ltd.
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Knut Asskildt
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Electric switching device
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Patent number 5,296,662
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Issue date Mar 22, 1994
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Asea Brown Boveri AB
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Goran Engdahl
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H01 - BASIC ELECTRIC ELEMENTS
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Magnetic circuit
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Patent number 4,914,412
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Issue date Apr 3, 1990
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Asea Brown Boveri AB
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Goran Engdahl
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H01 - BASIC ELECTRIC ELEMENTS
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Electrically controlled spring element
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Patent number 4,802,660
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Issue date Feb 7, 1989
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Asea Brown Boveri AB
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Goran Engdahl
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...