Tonska Kola 4 Radio Zagreba

Mobile studio of Radio Zagreb mounted in a bus, used for sound recording of live performances. Also known as TK4 or TK-4 of Radio Zagreb or of HRT later, somewhere wrongly called "Reportažna kola TK 4 Radio Zagreba" - Reportažna kola have acronyms RK 1, .. RK 4 and are used for television recordings.