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Ingots being prepared substrates for the manufacture of semi-conductors, silicon wafers, silicon chips, chips (integrated circuits), semiconductor wafers, wafers (silicon slices), reticles, circuit boards, semiconductors (integrated circuits), electronic circuit substrate, interface boards for electrical apparatus, electronic microcircuits, integrated circuits, integrated circuit boards, electronic circuits, semiconductor elements, commutators, solar energy collectors for electricity generation, solar panels for electricity generation, solar cells for electricity generation