![Érard Frères 1802 owned by Anne Angélique de Mackau, Comtesse de Saint-Alphonse - Eric Feller Early Keyboard Instruments Collection Érard Frères 1802 owned by Anne Angélique de Mackau, Comtesse de Saint-Alphonse - Eric Feller Early Keyboard Instruments Collection](https://www.ericfeller.de/wp-content/uploads/Erard-1802-Hammerfl%C3%BCgel-Piano-en-form-de-clavecin-Eric-Feller-Collection.jpg)
Érard Frères 1802 owned by Anne Angélique de Mackau, Comtesse de Saint-Alphonse - Eric Feller Early Keyboard Instruments Collection
Golden Era Piano Museum. - "Sebastien Erard" 90 note Grand Piano-Forte c1886. France. Érard's grand piano action (English patent no 4,631, 1821) is the predecessor to those used in modern grands, the
![Erard Restored Walnut Concert Grand for sale UK | P I A N O Z - The Ultimate Online Piano Showroom - UK Piano Shop - Black Baby Grands Erard Restored Walnut Concert Grand for sale UK | P I A N O Z - The Ultimate Online Piano Showroom - UK Piano Shop - Black Baby Grands](https://pianoz.com/sites/default/files/styles/max_1800/public/IMG_1853.jpg?itok=uV5jG_Xm)