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Manfred Keller
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Krefeld, DE
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last 30 patents
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Method of producing a vacuum
Patent number
4,973,227
Issue date
Nov 27, 1990
HWT Gesellschaft fur Hydrid-und Wasserstofftechnik m.b.H.
Otto Bernauer
F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...