Patent
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Patent:US126123
23.04.1872 A. W. Price : Improvement in Arithmetical Sum-Setter
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Patent:US129335
16.07.1872 Grant, George B. (P) : Calculating-machine
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Patent:US129531
16.07.1872 Benjamin C. Coldwell : Improvement in interest calculators
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30.07.1872 Henry Chandler : Improvement in counting-register
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06.08.1872 Wiliam Robjohn : Calculating-machine
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13.08.1872 E.D. Barbour : Improvement in calculating machines
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29.10.1872 Joseph W. Wormald : Improvement in Game-registers
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19.11.1872 E.D. Barbour : Improvement in calculating machines