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The Beginnings of Reckoning Aids
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37) Einblick in die Restaurierungsarbeiten des Arithmeums
36) Der Atanasoff Berry Computer von John Atanasoff und Clifford Berry
35) Zylindrische Vierspezies-Stellsegmentmaschine von Anton Braun
34) Die Additionsmaschine von Johann Jakob Sauter aus dem späten 18. Jahrhundert
33) Rechengerät aus dem 17. Jahrhundert - Burattini oder Morland?
32) Die Additionsmaschine von Charles Xavier Thomas aus dem Jahre 1849
31) Die „Grasshopper“ von George B. Grant aus dem Jahr 1871
29) Die koplanare Zahnscheiben-Addiermaschine von Didier Roth aus dem Jahr 1842
28) Die kreisrunde Staffelwalzenmaschine von Joseph Edmondson für alle vier Grundrechenarten
27) Koplanare Zahnscheiben-Addiermaschine von Charles Stanhope aus dem Jahre 1780
26) „Matador“-Tastenaddiermaschine mit Kurbel 1906
25) The single column key adding machine by Ferdinand Hebentanz from the year 1873
24) Column adding machine by Moses and William Pullen from the year 1874
23) „The Improved Adding Machine“ by Caroline Winter from 1859
22) The arithmetic manipulator by Niccola Guinigi from 1858
21) Tito Gonnella’s coplanar adding machine with tooth lock washers from the year 1859
20) The automatically multiplying calculating machine by François Timoléon Maurel and Jean Jayet from the year 1846
19) The “Z25” transistor computer by Konrad Zuse
18) Arthur Burkhardt’s Arithmometer – the start of calculating machine production in Germany at the end of the 19th century
17) Didier Roth’s circular calculating machine for automatic multiplication from 1841
16) The mechanical calculator for all four arithmetical operations by Anton Braun (1727)
15) “The Millionaire” – Calculating machine for direct multiplication by Otto Steiger
14) The four-species calculating machine with a switching latch by Heyde and Büttner from the year 1883
13) Four-species calculating machine with a switching latch mechanism by Friedrich Weiss from the year 1893
12) Prototype of the four-species calculating machine with a switching latch mechanism by Curt Dietzschold from the year 1876
11) Christel Hamann’s “Gauss-Mercedes” calculating machine with the unique stepped disc from the year 1909
10) Jacob Auch's adding machine
09) The "Hamann Manus" calculating machine
08) Adding machine by Philipp Matthäus Hahn
07) The patent model of Thomas de Colmar’s Arithmomètre from the year 1820
06) Multiplication Instrument by Samuel Morland
05) Johann Christoph Schuster's calculating machine
04) Blaise Pascal's calculating machine
03) The mechanical calculator for all four arithmetic operations by Axel Jacob Petersson
02) The mechanical calculator for all four arithmetic operations by Johann Jakob Sauter
01) The first mechanical calculator for all four arithmetic operations by Gottfried Wilhelm Leibniz
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Reckoning in the past
Theory and practice - universal genius Gottfried Wilhelm Leibniz
