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Renard series are a system of preferred numbers dividing an interval from 1 to 10 into 5, 10, 20, or 40 steps. This set of preferred numbers was proposed ca. 1877 by French army engineer Colonel Charles Renard and reportedly published in an 1886 instruction for captive balloon troops, thus receiving the current name in 1920s. His system was adopted by the ISO in 1949 to form the ISO

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