Publicity photo featuring “Professor” Alan Gordon-Finlay modelling his <b>Stethophone</b>, a kind of early <a href="//commons.wikimedia.org/w/index.php?title=Earbud&amp;action=edit&amp;redlink=1" class="new" title="Earbud (page does not exist)">earbud</a> fitted with "pneumatic ear pads", circa 1927 - ILO Historical Archives
International Labour Organisation
1927
ILO Historical Archives