This patent includes adjustable iron bars for grands, squares and uprights, essentially to "adjust crown of the soundboard" as needed. It also includes some action designs, double escapement for uprights (he patented other designs as well for uprights as well as some for grands), and use of ...
FR 70701.pdf
This piano, which has a one-piece, "double-iron" frame with struts in front and behind the soundboard, also features a "resonator" (US patent #55,385 by William Steinway, June 5, 1866), a whole-perimeter soundboard-compression mechanism. Another interesting feature is the "unifying bridge,"...
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