| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Austria | 3 | |
| #2 | Germany | 3 | |
| #3 | Switzerland | 2 | |
| #4 | Spain | 2 | |
| #5 | United Kingdom | 2 | |
| #6 | Belgium | 1 | |
| #7 | Denmark | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Thermal processes | |
| #3 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Finishing work on buildings | |
| #2 | Unspecified technologies | |
| #3 | Air-conditioning | |
| #4 | Supplying fuel to combustion device |
| # | Name | Total Patents |
|---|---|---|
| #1 | Hekelaar Johannes Petrus | 2 |
| #2 | Nyst Alfred | 2 |
| #3 | Johannes Petrus Hekelaar | 1 |
| #4 | Pol E J M Van De | 1 |
| #5 | Handelsonderneming E M Van De | 1 |
| #6 | Rosendale Douwe | 1 |
| Publication | Filing date | Title |
|---|---|---|
| DE1813683A1 | Ventilation control device | |
| ES230915A1 | Ventilation system for a building, for example a divided building in floors (Machine-translation by Google Translate, not legally binding) | |
| ES230787A1 | Landfill gasket for channel of garbage (Machine-translation by Google Translate, not legally binding) | |
| GB760372A | Improvements relating to smoke and ventilation shaft arrangements in buildings | |
| GB774122A | A chimney construction | |
| DE827544C | stack |