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I remember that NASA engineers used to boast that they could work out a solution on their slide rules faster than the computers could.
Yes, I used to use a T-Square in tech-drawing class, on a drawing board. It was supplemented with various set squares.
As for biro's, here's a great analogy. NASA spent millions of dollars developing a pen that would work in zero gravity. The Soviets used a pencil.
Clear skies,
Shane
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