Inch   vs.   Metric   R U L E R S



There are 200 years of progress in between ... But the USA ?



Inch & Metric / Architectural & Engineering Scales



The Bakelite/Aluminum Parallel Ruler »ROLLBOY« from the '50s

impressum:
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© C.HAMANN        http://public.beuth-hochschule.de/~hamann        07/22/09