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For good measure from the National Bureau of Standards.



Corporate Author: United States.
Language(s): English
Published: Washington, D.C. : U.S. Dept. of Commerce, National Bureau of Standards, 1972.
Subjects: Standards of length.
Weights and measures.
Note: Original item is a 6 inch/15 cm plastic ruler.
Physical Description: 1 p : 28 cm.
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