Hauptplatz, Graz - 16.5kHz acoustic anti-vandal system at the fountain
关于这个声音
Sonic anti-vandal-system, Hauptplatz, Innere Stadt, Graz, Österreich - Hauptplatz, Graz - 16.5kHz acoustic anti-vandal system at the fountain by Fritz Schlüter (10.05.2013 15:20) [aporee.org/CC-BY]