List of Keyboards 

The German (Kalkar) pianomaker W. Neuhaus Söhne (descendant from Wilhelm Neuhaus) produced an upright piano in 1882 with a curved keyboard

Photo Credit: Hermans Wikicommons

It is believed to be the first known instrument made by Neuendorff, as well as the earliest known cabinet piano of Swedish manufacture.

This square piano was made by Samuel Neilson in New York, New York around 1807-1815. He was listed at 19 Barclay Street, the address on the nameboard of the piano, during this time period. The only other known instrument by Samuel Neilson is a 6-octave square piano in he Kenneth G. Fiske Museum of Musical Instruments. This piano has a compass of FF-c4, an English double action, leather covered with felt hammers, double-strings throughout, with tuning pins on the right, 1 pedal: dampers, wood frame, and a mahogany (?) case 

Credit: Smithsonian 

This square piano is attributed to Jn. Nägelé in Paris, France after 1800. The inscription on the nameboard reads “Jn. Nägelé / Rue de la Tixérandérie en face du Mouton No 15 à Paris 1785.” It is doubtful that this piano was made by Nägelé as several factors about this instrument are problematic. Though the nameboard is inscribed with the date 1785, it was originally made for a smaller instrument and has been extended on both ends. There is also indication that the compass of the piano has been extended. 1785 is too early a date for a piano with this compass. This piano is serial number 15 and has a compass of FF-f4, single (Zumpe) action, leather hammers, double-strings throughout, first 12 notes are wound, tuning pins on the right, 2 knee levers: lute (missing) and dampers, wood frame, and a wood case

Credit:Smithsonian

Photo Credit: Piano Technicians Guild

Photo Credit: Wikicommons Enric