Harto Helpinen

Follow

Person

Espoo, FI

People

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