age of the conductivity of a reference material usually the International

Age of the conductivity of a reference material

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age of the conductivity of a reference material, usually the International Annealed Copper Standard. 2–3 CLASSIFICATION OF METALS AND ALLOYS Various industry associations take responsibility for setting standards for the classification of metals and alloys. Each has its own numbering system, convenient to the particular metal covered by the standard. But this leads to confusion at times when there is overlap between two or more standards and when widely different schemes are used to denote the met- als. Order has been brought to the classification of metals by the use of the Unified Numbering Systems (UNS) as defined in the Standard E 527-07, Standard Practice for Numbering Metals and Alloys (UNS) , by the American Society for
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