Development of mineral water company started at Radenci in 1869, when Karl Henn, owner of the land, filled the first bottles of mineral water. Over 50 years later (in 1923) has been recognized as a mineral water healing since 1936 and it uses the symbol of three red hearts.
Mineral water brand name Radenska Three Hearts (Radenska Tri srca) has been in use since 1936. It was designed in 1931 by the illustrator Milko Bambič. According to the author, the three hearts symbolised three former nations of the Kingdom of Yugoslavia: Serbs, Croats, and Slovenes.
^Kavčič, Igor. Sitar, Iztok (3 November 2007). "Slovenski strip spet zeleni" [Slovene Comic Strip Turns Green Again]. Gorenjski glas (in Slovenian). GG Plus.CS1 maint: Multiple names: authors list (link)