 It is likely that they relocated their business to Germany during the Thirty Years' War, where François cast his first swinging bell.In 1641, they first cast swinging bells in the Netherlands for the Reformed Church in Goor, but their career reached a watershed when they settled in Zutphen and cast the world's first tuned carillon, installed in Zutphen's Wijnhuistoren tower, in 1644.That instrument was lost to fire in 1920.