The World's Smallest Mechanical Parallel Calculator: Discovery of Original Drawings and Patent Documents from the 1950s in Switzerland | SpringerLink
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Mechanical Calculating Aids | SpringerLink
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PDF) Finding the World's Smallest Mechanical Parallel Calculator
The World's Smallest Mechanical Parallel Calculator: Discovery of Original Drawings and Patent Documents from the 1950s in Switzerland | SpringerLink
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Finding the World's Smallest Mechanical Parallel Calculator | blog@CACM | Communications of the ACM
