The invention relates to track systems 14, 14\u2032 that may be used to convert steerable, all-wheel drive construction equipment to steerable, multi-track construction vehicles 10. The antenna includes a first conductor section electrically coupled to a first feeding point, a second conductor section electrically coupled to a second feeding point, and a near-field radiation control structure adapted to control characteristics of near-field radiation generated by the antenna. The reduced agglomerates, in which the Ni component has been primarily reduced as compared with the Fe component, are smelted in a smelting furnace, whereby ferronickel having a high Ni content is obtained. Methods for producing the materials and electrochemical cells and batteries that include the materials are also provided. This allows increasing the rate of data transfer when the need justifies an increased card circuit complexity. In an inorganic material content adjusting process, appropriate amounts are fed from the respective recovery towers into a mixer so as to prepare mixed waste materials whose inorganic material content has been adjusted.