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METHOD OF MANUFACTURE OF STANDARDS FOR NON-DESTRUCTIVE ELECTROMAGNETIC TESTING OF QUALITY OF METAL ELEMENTS AFTER VOLUME HEAT TREATMENT AND SUBSURFACE QUENCHED AND TEMPPERED LAYERS OF METAL ELEMENTS,ESPECIALLY SUBJECTED TO HEAT TREATMENT
METHOD OF MANUFACTURE OF STANDARDS FOR NON-DESTRUCTIVE ELECTROMAGNETIC TESTING OF QUALITY OF METAL ELEMENTS AFTER VOLUME HEAT TREATMENT AND SUBSURFACE QUENCHED AND TEMPPERED LAYERS OF METAL ELEMENTS,ESPECIALLY SUBJECTED TO HEAT TREATMENT
