Rückers
... The Ruckers family (variants Ruckaert, Ruckaerts, Rucqueer, Rueckers, Ruekaerts, Ruijkers, Rukkers, Rycardt) were Flemish harpsichord and virginal makers based in Antwerp in the 16th and 17th ... The Ruckers family contributed immeasurably to the harpsichord's technical development, pioneering the addition of a second manual the quality of their ... In the 18th century, Ruckers instruments were often modified by French makers in a process known as ravalement, to allow for an extended range and other additions ...