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Calculating-Machine.
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.
System:
The Portal to Texas History