While visiting a steel company in Wuppertal (Germany) the concept was formed to eliminate the grinding dust. In this company four employees have been working on ship bulkhead doors for shipyards in a production hall of around 150 m². Caused by the grinding with abrasive flap-wheels, grinding- and cutting discs, the air within the production hall was filled by a mixture of air and abrasive dust. Due to this, the workers have been covered with grinding dust, making breathing almost impossible. All tools, machines and furniture, even the lunch boxes and coffee pots have been black from the dust. In the 21st century often so called “silicosis”, even more chrome…