By the 1960s, when this cardboard box was made, slide rules were an established symbol of the technical education of young Americans. They came with considerable packaging – not only a leather or plastic case but a set of instructions and a guarantee. This box, made by the American firm of Pickett, was designed for the company’s model N4M-ES slide rule. The N indicates that the cursor was nylon, the M that it magnified the portion of the scales below it, and the ES that it was in “eye saver” yellow rather than the more usual white. The box also holds a guarantee – but no slide rule or case.
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