<i>Visiting a nail factory</i>, painted by Léonard Defrance (1735-1805).
<bdi><a href="https://en.wikipedia.org/wiki/en:L%C3%A9onard_Defrance" class="extiw" title="w:en:Léonard Defrance"><span title="Walloon painter (1735-1805)">Léonard Defrance</span></a>
</bdi>
<i>Le siècle des Lumières dans la principauté de Liège</i>, museumcatalogus, Musée de l'Art wallon, Luik, 1980, p.71