Bladsye wat na "Lêer:Arithmometre, designed by Charles Xavier Thomas, c. 1820, for the four rules of arithmetic, manufactured 1866-1870 AD, TM10901 - Tekniska museet - Stockholm, Sweden - DSC01567.JPG" skakel
Die volgende bladsye skakel na Lêer:Arithmometre, designed by Charles Xavier Thomas, c. 1820, for the four rules of arithmetic, manufactured 1866-1870 AD, TM10901 - Tekniska museet - Stockholm, Sweden - DSC01567.JPG:
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