St.Petersburg School in Estonian engineeringMägi, VahurXXX Symposium of the International Committee for the History of Technology : ICOHTEC 2003 : August 21st-26th, 2003, St.Petersburg - Moscow, Russia2003 / p. 87-89 The early history of the legendary mini-camera Minox in EstoniaHendre, EnnXXX Symposium of the International Committee for the History of Technology : ICOHTEC 2003 : August 21st-26th, 2003, St.Petersburg - Moscow, Russia2003 / p. 55-56