Broadwood & Son 1804, London
(1783 patent)
Martin 1825, Madrid
Broadwood & Sons 1825, London
Chickering & Mackays ca. 1838, Boston
Robert Wornum ca. 1840, London
Robert Wornum & Sons ca. 1850, London
Chickering & Sons ca.1857, Boston
Stodart ca.1857, New York
Chickering & Sons ca. 1857, Boston