Renard series are a system of preferred numbers dividing an interval from 1 to 10 into 5, 10, 20, or 40 steps. His system was adopted by the ISO in 1949
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Further reading
- https://web.archive.org/web/20171102005125/https://www.forgottenbooks.com/en/download/SizeStandardizationbyPreferredNumbers_10296778.pdf -->
- (Replaced: )