1. Exstincto et temperato ferro durities probatio exstincti et temperati ferro maxime utitur Rockwell duritie probator HRC scala.Si materia tenuis est et scala HRC non apta, scala HRA loco adhiberi potest.Si materia tenuior est, superficies Rockwell durities squamae HR15N, HR30N, vel HR45N...
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