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katse viib läbi tootja, kontrollides kõvaduskatse või mõne teise asjakohase meetodi abil, et algmaterjali (lehtmetall, toorik, torulõik) valikul ja termilise töötluse käigus pole tehtud vigu.
this test, which is carried out by the manufacturer, involves checking by means of a hardness test or some other appropriate means that no error has been made in the choice of the original material (sheet metal, billet, tubing) or in carrying out the heat treatment.