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in subjects: "calculators"  
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Tax-Calculating Device

Description: Patent for a tax calculating device that will calculate the percentages of the total tax that need to go to different agencies.
Date: April 23, 1912
Creator: Goss, George W.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Calculating-Machine.

Description: Patent for an improvement to mechanical calculators by providing the "means for facilitating the addition of successive numbers of the same or different denominations, and also for subtracting and multiplying the same by substantially the means employed in adding" (lines 10-14). It includes a written explanation and illustrations.
Date: April 17, 1894
Creator: Stallard, Sherman R.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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