Transferred from en.wikipedia to Commons by Maksim. The original description page was here. All following user names refer to en.wikipedia. Chinese rod...
File:Calculator.kodabar.jpg 205 4 190 95 400 400 A counting rod, from File:Countingrod.png 5 2 190 142 400 400 Part of Charles Babbage's Difference Engine, from...
CommonsHelper. Author The original uploader was Zhuwq at Chinese Wikipedia. Other versions without chinese text: File:Countingrod.png, File:Chounumerals.jpg...
