Moses Korn, a member of a Sonderkommando 1005 unit, poses next to an alleged bone crushing machine in the Janowska concentration camp. 
Source: Nuremberg Trial Proceedings Vol. 7, 59th Day, Thursday, 14 February 1946, Morning Session, pg 438-439 (Yale Law School)
All these monstrous crimes had a definite system of their own. There was uniformity in the murder methods: One and the same system prevailed in the construction of the gas chambers, in the mass production of the round tins containing the poisonous substances "Cyclone A" or "Cyclone B." the ovens of the crematories are all built on the same typical lines, and one was the plan extending over all the camps of destruction. There was uniformity in the construction of the evil-smelling death machines, which the Germans referred to as "gaswagen" but which our people called the "soul destroyers"; and there was the same technical elaboration in the construction of mobile mills for grinding human bones. All this indicates one sole and evil will uniting all the individual assassins and executioners.
It became obvious that German thermo-technicians and chemists, architects, toxicologists, mechanics, and physicians were engaged in this rationalization of mass murder on instructions received from Hitler's government and from the Supreme Command of the German Armed Forces. It was also evident that the "death factories" brought into existence an entire series of auxiliary industries.
-Nuremberg Trial Proceedings Vol. 7, 59th Day, Thursday, 14 February 1946, Morning Session, pg 438-439
via the research of Carlos Whitlock Porter