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Arkkitehtuuritoimisto Harto Helpinen Ky
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Espoo, FI
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Patents Grants
last 30 patents
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Patent Grant
Noise barrier
Patent number
5,902,969
Issue date
May 11, 1999
Arkkitehtuuritoimisto Harto Helpinen Ky
Harto Helpinen
E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES