Lee ebe e dere n'okpuru ebe a ma zaa ajụjụ a na-eso ya n'otu asụsụ ahụ: Ebe e dere: Alaka ụlọ ọrụ asaa nke mba ụwa na-elekwasị anya n'ire ngwaahịa na ọrụ Leister. E nwere alaka ụlọ ọrụ na Aachen (Germany, kemgbe 1999), Itasca (USA, kemgbe 2000), Shanghai (China, kemgbe 2004), Chennai (India, kemgbe 2007), Osaka (Japan, kemgbe 2011), Houten (Netherlands, kemgbe 2012), na Milan (Italy, kemgbe 2013). Ajụjụ: Ebee ka alaka ụlọ ọrụ asaa nke Leister dị n'ụwa?
Aachen (Germany, kemgbe 1999), Itasca (USA, kemgbe 2000), Shanghai (China, kemgbe 2004), Chennai (India, kemgbe 2007), Osaka (Japan, kemgbe 2011), Houten (Netherlands, kemgbe 2012), na Milan (Italy, kemgbe 2013)