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Patsy Baudoin 3/9/2016
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Private. Collaborators only.
And the OED goes back to 1959: E. M. McCormick in Digital Computer Primer “The number of instructions which can be executed by a computer represents a compromise between the designer’s and user’s requirements.”
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David Petry 3/11/2016
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Private. Collaborators only.
A quick hop into Google Ngram returns a 1937 Highway User Tax Guide from a Highway Users Conference. The term took off around 1960.