Machines and parts thereof to be used in the industries of paints, varnishes, inks, pigments, dyes, magnetic lacquers, enamels, inorganic fillers, phytopharmaceutical products, cosmetics and, in a general manner, for the milling and/or micronizing and/or dispersing of a broad range of products for various applications; beads (as elements of machines and industrial equipment), in particular ceramic beads such as fused beads of the zirconia-silica system, said beads being intended to be used as milling and/or micronizing and/or dispersing agents in industrial machines and equipments; machines and machine tools; motors and engines (except for land vehicles); machine coupling and transmission components (except for land vehicles); agricultural implements; incubators for eggs