Antikythera device (1st century B.C.) |
William Pratt (1616) |

Charles Cotterell (1667) |
Claude Dechales (1677) |

George Brown (1699) |
Francis Marston(1842) |

Jean-Paul Garnier (1843) |
Jehu Hatfield (1844) |

Policarpo de Balzola (1847) |
Nystrom's Calculator (1848) |

Samuel Young (1849) |
William Haines (1849) |

Aaron Hatfield's Adder (1854) |
Ernest-Narcisse LobbĂ© (1855) |

James Appleby (1856) |
Jabez Burns' Addometer (1858) |

Leonard Nutz (1858) |
Jacot des Combes (1860) |

John Ballou's Adding Machine (1860) |
Herschell Filipowski (1860) |

Thomas Strode (1860) |
David Nelson (1860) |

Joseph Harris (1861) |
Fowler's Adding Machine (1863) |

Milton Jeffers (1863) |
Samuel Kelso (1863) |

Friedrich Arzberger (1866) |
Samuel Comfort (1866) |

George Farmer (1867) |
Viktor Bunyakovsky (1867) |

Alexander Davies (1867) |
Amos Mendenhall (1867) |

Alonzo Johnson (1868) |
Webb's Adders (1868 and 1886) |

Charles Corliss (1868) |
Elizur Wright (1869) |

Gilbert Chapin (1870) |
Groesbeck's Adding Machine (1870) |

Henry House (1870) |
Emery Hamilton (1871) |

Frederick Warren (1872) |
William Robjohn (1872) |

Solomon Pool (1873) |
Gustavus Linderoos (1873) |

Stephenson's Adding Machine (1873) |
Elmore Taylor (1874) |

Spalding's Adding Machine (1874) |
Alexis Petetin (1875 and 1884) |

Calvin Holman (1874) |
Niels Larsen (1876) |

David Carroll (1876) |
Calculators of Chambon (1876) |

Marshall Cram (1877) |
Oskar Leuner (1877) |

Juri Diakov (1878) |
Reuben Rodney James (1878) |

Hart's Mercantile Computer (1878) |
Borland and Hoffmann (1878) |

Milton Hinkle (1878) |
James Ritty (1879) |

William Briggs (1879) |
HellstrĂ¶m's Adder (1879) |

Leonard Stowe (1880) |
Hugues Beaucourt (1881) |

Peter Forrester (1881) |
Winter and Crary (1882) |

Christian Hergenroeder (1882) |
Eduard Hammenstede (1882) |

Walter Snelling (1882) |
Fawcett Plumb (1882) |

Albert Stettner (1882) |
David Marion Rush (1883) |

de Azevedo Coutinho (1884) |
Max Mayer (1884) |

Andrew Stark (1884) |
William Macnider (1885) |

Charles Weiss (1886) |
Peter Lindholm (1886) |

Lawrence Swem (1886) |
Brainard Smith (1887) |

Moore family (1874, 1888, 1889) |
Jacob Schnarrenberger (1888) |

Otto Lilienthal (1888) |
Calculators of Louis Troncet (1889) |

John Pfeifer (1889) |
Ezra Edgar Witter (1890) |

William Lang (1890) |
Hugo Cook (1891) |

Landin Computer (1891) |
Melvin Newton Lovell (1891) |

Centigraph Adding Machine (1891) |
Fossa-Mancini (1896) |

Arithmachine (1898) |
Georges Lafond (1899) |

Calcumeter (1901) |
Locke Adder (1901) |

Adix adding machine (1901) |
Golden Gem adding machine (1901) |

Adder (1902) |
BriCal Calculator (1905) |

Judah Levin (1906) |
Computometer (1907) |

Bassett Adder (1909) |
Add-A-Mite (1950) |