In the 1920s and 1930s what accounted for one third of IBMs sales?
I will put the spoiler down below. In the comments let us know if you guessed correctly or missed it. For those who get it wrong, you will have to spend the day in the Ratburger.org stocks.
The lowly punch card accounted for a third of IBM’s sales in the 1920s and 1930s. Those cards were ubiquitous at one time.
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