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unified numbering system

an alloy designation system widely accepted in North America

en-GB/ˈjuːnɪˌfaɪd ˈnʌmbəɹɪŋ ˈsɪstəm/
en-US/ˈjunəˌfaɪd ˈnʌmbɚɪŋ ˈsɪstəm/

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technical standardsystem