in Argentina
... that a radio ad in Argentina for 'Los Andes Restaurant', which first aired in 1922, is the oldest known radio commercial in history?
... that a <a href="./Radio_broadcasting" id="mwCjk" rel="mw:WikiLink" title="Radio broadcasting">radio</a> <a href="./Advertising" id="mwCjo" rel="mw:WikiLink" title="Advertising">ad</a> <b id="mwCjs"><a href="./Radio_in_Argentina" id="mwCjw" rel="mw:WikiLink" title="Radio in Argentina">in Argentina</a></b> for 'Los Andes Restaurant', which first aired in 1922, is the oldest known <a class="mw-redirect" href="./Radio_commercial" id="mwCj0" rel="mw:WikiLink" title="Radio commercial">radio commercial</a> in history?