| 5312296 |
False-ceiling construction and method for the flow of air in connection with a false-ceiling construction |
Erkki Aalto, Pekka Kyllonen |
1994-05-17 |
| 5220910 |
Device and method for ventilation |
Erkki Aalto, Pekka Kyllonen |
1993-06-22 |
| 5133689 |
Focussed ventilation procedure of a work spot and a focussed ventilation means |
Erkki Aalto, Jouko Eloranta |
1992-07-28 |
| 5074198 |
Focussed ventilation procedure for a work spot and apparatus used in the procedure |
Erkki Aalto, Jouko Eloranta, Tapio Alapuranen |
1991-12-24 |
| 5063834 |
Focussed ventilation procedure and focussed ventilation means |
Erkki Aalto, Jouko Eloranta |
1991-11-12 |
| 4903894 |
Ventilation control procedure and ventilation control means |
Mertsi Niemela, Erkki Aalto |
1990-02-27 |
| 4890544 |
Air distribution system |
Erkki Aalto, Jouko Eloranta |
1990-01-02 |