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Hunenberg, CH
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Patents Grants
last 30 patents
Information
Patent Grant
Soil heat exchanger
Patent number
5,937,934
Issue date
Aug 17, 1999
Geohil AG
Hans Hildebrand
F24 - HEATING RANGES VENTILATING
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Patent Grant
Arrangement for effecting an energy exchange between earth soil and...
Patent number
5,738,164
Issue date
Apr 14, 1998
Geohil AG
Hans Hildebrand
F24 - HEATING RANGES VENTILATING
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