Olli Virtanen

Follow

Person

Parainen, FI

People

Patents Grantslast 30 patents

Information Patent Grant
Procedure for the production of concrete elements
- Patent number 4,865,887
- Issue date Sep 12, 1989
- Oy LohJa AB
- Olli Virtanen
- B28 - WORKING CEMENT, CLAY, OR STONE