On 23 April 1873, one Ferdinand Hebentanz, from Budapest, obtained a privileg (patent) in Austria-Hungary for several adding machines. In fact, in the patent are described three different devices: keyboard adding machine without engine, keyboard adding machine with engine (spring motor), and pointer (pen-setting) adding machine or totaliser. In October of the same year one of adding machines of Hebentanz was presented and received an award at Weltausstellung 1873 Wien (World Exposition 1873 in Vienna).
The second machine, known also as Bieringer und Hebentanz Tastertur Aditions Maschiene is a keyboard adding machine with clock mechanism (spring) drive. It seems several devices had been manufactured and one of them managed to survive to our time (see the lower images).
We don’t know who was the inventor of this machine. He would be Ferdinand (Nandor) Hebentanz (born circa 1845, died 19 Aug. 1914), who at the end of 19th century worked as Rechnungsführer (chief accountant) of Budapest Sparkassa (Savings Bank). Nandor Hebentanz definitely needed such machine for his daily work as young accountant in early 1870s.