Scent of Mystery
...that the 1960 mystery film Scent of Mystery was the first and only feature-length film to be shown in Smell-O-Vision?
...that the 1960 <a href="./Mystery_film" id="mwDco" rel="mw:WikiLink" title="Mystery film">mystery film</a> <i id="mwDcs"><b id="mwDcw"><a href="./Scent_of_Mystery" id="mwDc0" rel="mw:WikiLink" title="Scent of Mystery">Scent of Mystery</a></b></i> was the first and only feature-length film to be shown in <a href="./Smell-O-Vision" id="mwDc4" rel="mw:WikiLink" title="Smell-O-Vision">Smell-O-Vision</a>?