Butchers' machinery; knifeplate and perforated plates for knives with bush, for meat mincers, sizes 70 to 300
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 08/01/1977

Food processing machinery – Precutter and holeplates for mincers – System Unger
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 02/01/2017