 Starting in 2005, Michael Friedrichs-Friedländer has partnered with Gunter Demnig to install about 63,000 "Stolperstein" in 20 different languages.Friedrichs-Friedländer explained to a reporter that he has not changed the engraving process and all engraving continues to be completed by hand; this is purposeful, to prevent the process from becoming anonymous.On 16 December 1992, 50 years had passed since Heinrich Himmler had signed the so-called "Auschwitz-Erlass" ("Auschwitz decree"), ordering the deportation of Sinti and Roma to extermination camps.