spinning wheels had increased the productivity of labor about 3 times, first used in the Han China or even earlier but came to Europe only in the 13c
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I think about this stuff in terms of when did X *capability* become available to humanity. Capability seems like when invention meets practicality. Once a new thing is a legit capability, then we can actually apply it towards useful ends.
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This is interesting. I don't think electronic computers could have been invented prior to 1926 with the pentode https://en.wikipedia.org/wiki/Vacuum_tube#Tetrodes_and_pentodes …, and probably before 1915 hard vacuum tube. The 1907 tube sometimes "would barely work at all" https://en.wikipedia.org/wiki/Audion
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