- Action by Andreas and Nanette (Stein), Streicher Viennese escapement (1794)
- Arrangement of iron plate, braces and scale of parlor size grand pianoforte
- Back view of upright pianoforte
- Cristofori’s action in its final form
- Double repetition action of Sebastian Erard as used by S. & P. Erard, Paris
- English direct lever grand action, developed by Broadwood from Backers (1884)
- Grand pianoforte action with metallic action and damper frames
- Iron plate for upright pianoforte fitted with Capo D’astro bar
- Iron plate for upright pianoforte with Agraffes (Mehlin patents)
- Jonas Chickering’s full solid cast grand metal plate
- Modern method og grand pianoforte case construction
- Sketch of iron plate for concert grand
- Standard American upright action
- Standard modern American grand action
- The Erard grand action modified by Herz
- Upright action showing lost-motion device