Logo de <a href="https://fr.wikipedia.org/wiki/Aperture_Science" class="extiw" title="fr:Aperture Science">Aperture Science</a>.
<a href="https://fr.wikipedia.org/wiki/Valve_Corporation" class="extiw" title="fr:Valve Corporation">Valve Corporation</a>
<a rel="nofollow" class="external free" href="http://half-life.wikia.com/wiki/File:Aperture_Science_grey.svg">http://half-life.wikia.com/wiki/File:Aperture_Science_grey.svg</a>