The First Key Punch


Source: Geoffrey Austrian, Herman Hollerith [44]; CLICK to magnify.

Patented by Herman Hollerith in 1901 for use with his newer tabulators, which required punching or skipping over any card column from left to right. It was used in the 1900 US Census [44]. Punches like this one (including the 1923 electric model) were manufactured for nearly half a century.

Last Update: Sat Jan 3 16:26:32 2004


Frank da Cruz / fdc@columbia.edu / Columbia University Computing History