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Patent:US73290
14.01.1868 F. Bowly : Instrument for describing Ellipses
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21.01.1868 Levi Keiler : Improvement in Calculating-machines
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28.01.1868 Alonzo Johnson, Springfield, Mass., assignor to Sylvester Bissell and Andrew B. West, Hartford,Conn. : Calculating-apparatus
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04.02.1868 Thomas T. Strode : calculating & registering machine
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18.02.1868 Wallworth, Thomas : Apparatus for Computing or reckoning quantities
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10.03.1868 Webb, Charles Henry (P) : Adding Machine
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12.05.1868 I.S. Hyatt : Tax Calculator
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23.06.1868 C. Corliss : Instrument for Adding Figures
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23.06.1868 C. Corliss, N. Spofford : Instrument for Adding and Registering Numbers
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21.07.1868 C. Littlefield : Measuring Lumber
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04.01.1868 Jacob S. Detrick William R. Eckert : Counting-register
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01.12.1868 E. A. Chameroy : Fluid Meter
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22.01.1868 Alonzo Johnson, Springfield, Mass., assignor to Sylvester Bissell and Andrew B. West, Hartford,Conn. : Calculating-apparatus