Early polishers used three types of stone, whereas a modern polisher generally uses seven. It is the final step after polishing rice with a rice polisher. The whitened rice is polished by a silky polisher. Until 1917 he worked as a machinist polisher at factories in Libau, Petrograd, Lysva. His father worked as a diamond polisher and setter. Lodewyk van Bercken was a Flemish diamond polisher who invented the scaif. His mother was a mill worker and French polisher, and his father a carpenter. Then he would pass it on to a polisher and finisher. Eddowes worked as a tray polisher in Birmingham for four months before returning to Wolverhampton. From 1922 to 1924 he worked as a polisher in a metal factory in Nuremberg. Struers A/S of Copenhagen introduced the electrolytic polisher to metallography in 1943. In 2010, SEBO introduces the "DISCO" polisher buffer. His father had little education; he worked as a metal polisher. Common injection points are just after the condensate polisher and again at the deaerator outlet. The term "frotteur", originally meaning "floor polisher", entered police jargon around 1882.