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Slide Rule , Pocket calculators only came into common use in the 1970s. Digital computers first appeared in the 1940s, but were not in widespread use by the gener… Rule , rule / roōl/ • n. 1. one of a set of explicit or understood regulations or principles governing conduct within a particular activity or sphere: the r… Romers Rule , Skip to main content
Romers rule Queensberry Rules , Queensberry Rules the standard rules of boxing, originally drawn up in 1867 to govern the sport in Britain, named after John Sholto Douglas (1844–190… Glogers rule , Gloger's rule Individuals of many species of insects, birds, and mammals are darkly pigmented in humid climates and lightly coloured in dry ones. Thi… Relative Age , Skip to main content
relative age
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