| Country of Origin | United States |
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Check the listing for details. 1960's DUNWOODY Info Chart Formulas Decimals Drill Bits Thread Size. Condition: Used, Made in United States. Listed at 12.99 USD. Original chart from the Dunwoody Industrial Institute in Mpls MN. Printed in 1963. Thread and drill bit sizes. Decimal Equivalents Spacing Holes and Math formulas. Lots of basic info.