 Even so, it was a great success in different exhibitions, Malling-Hansen and Halll, received the first prize medal at a large industrial exhibition in Copenhagen in 1872, and at the world exhibitions in Vienna in 1873, as well as in Paris in 1878.That year Malling-Hansen developed a fast speed writing machine to be used for stenography, called the Takygraf.Malling-Hansen was also the first person to discover the unique possibilities of blue carbon paper, and developed a copying technique he called the Xerografi.