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Re:I found Katherine Johnson's calculations at NASA [video] by kevin_thibedeau on Monday May 23, 2022 @05:31PM (#31485012)
There were typewriters with math symbols:

https://www.mrmrsvintagetypewriters.com/products/hermes-3000...

Notably, Dijkstra used a modified Hermes with a mixture of different type bars to get the output he wanted in his earlier EWDs.

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