Nannette Streicher was a respected fortepiano maker in Vienna. Mozart owned a fortepiano made by her father, Johann Andreas Stein, and she carried on his legacy by making fortepianos for Beethoven and
Richard Fuller's Fortepiano Page - Fuller's Fortepiano, after J.A. Stein, 1788 | Facebook
The Art of Building a Fortepiano | Daniel Adam Maltz