english: He was upset by the low quality and high cost of existing patent reproductions, and so he started to develop a system of dry photocopying, which he patented in the late 1930s -- and which became the first dry photocopier that was commercially practical in 1960.
non_english: Bio je uznemirem zbog lošeg kvaliteta i visokih troškova postojeće reprodukcije patenata, i zato je počeo da razvija sistem suvog fotokopiranja, koji je patentirao krajem '30-ih godina - i koji ie je postao prvi suvi fotokopir komercijalno korišćen u 1960. godini.