Consider The QWERTY keyboard. It was primarily invented so flamboyant typewriter sales people can type TYPEWRITER in one motion demonstrations to wow potential customers. Read more here https://qr.ae/TW8Np4 In this lost 1943 film we can see a history of typewriters...pic.twitter.com/xVn4M2UkGq
Marcin, if you study the Sholes patent it is clear that the e & r were on the same bar and in addition the layout was not specified to be a method to stop key lock ups. And this would have been an embodiment presented even in the late 1800s.
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Marcin, more pertinently data on touch typing. In the early years typists simply were not fast enough to cause many of the theoretical key pair lock ups that many postulate is the reason for QWERTY. It was not until Mo. 2 when early typing methods arrived, primarily through YWCA.pic.twitter.com/D339uGxkmC
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