DIN CEN/TS 15810
DIN CEN/TS 15810 Graphical symbols for use on integrated building automation equipment; German version CEN/TS 15810:2008
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 03/01/2009
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 03/01/2009