trademark
— used for a method of testing a ferrous metal for defects by magnetizing the material and observing the patterns assumed by iron powder applied either dry or in liquid suspension
trademark
— used for a method of testing a ferrous metal for defects by magnetizing the material and observing the patterns assumed by iron powder applied either dry or in liquid suspension
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012