"... Malling-Hansen went in 1873 to the world exhibition in Vienna with the (old) writing ball in the box, the (new) Takygraph 2 and the (new) writing ball with the flat carriage. He got the progress-medal which some descendants own today. At this exhibition Malling-Hansen met Albert v. Szabel. Albert v. Szabel got, in the name of Malling-Hansen, the patent for the Takygraf in 1873 and produced later a few writing balls in Vienna. ..." - http://www.malling-hansen.org/letters-by-malling-hansen/letter-overview/18720917-english-to-general-consul-carl-b-lorck.html, 18.01.2020
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