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44) The square root unit of the Friden SRW automatic square root mechanism
43) The concept for Maurel's calculating machine from 1842
42) The Piano Arithmomètre from the 1855 World Exhibition
41) The adding machine of Thomas de Colmar
40) The Walther DMKZ
39) The Curta
38) The carry of tens by Gottfried Wilhelm Leibniz 1677
37) Insight into the restoration work at the Arithmeum
36) The Atanasoff Berry Computer by John Atanasoff and Clifford Berry
35) Cylindrical four-species adapting segment machine from Anton Braun
34) Johann Jakob Sauter's adding machine from the late 18th century
33) Calculator from the 17th century - Burattini or Morland?
32) The adding machine by Charles Xavier Thomas from 1849
31) The “Grasshopper” by George B. Grant from 1871
30) The Centennial four-species calculating machine by George B. Grant
29) Didier Roth's coplanar toothed disk adding machine from 1842
28) Joseph Edmondson's circular stepped drum machine for all four basic arithmetic operations
27) Coplanar toothed disk adding machine by Charles Stanhope from 1780
26) “Matador” keyboard adding machine with crank 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
Calculating in olden times
The Beginnings of Reckoning Aids
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