Arkkitehtuuritoimisto Harto Helpinen Ky

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Patents Grantslast 30 patents

Information 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