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Modern method og grand pianoforte case construction

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Modern method og grand pianoforte case construction.png Sketch of iron plate for concert grandThumbnailsItalian SpinetSketch of iron plate for concert grandThumbnailsItalian SpinetSketch of iron plate for concert grandThumbnailsItalian SpinetSketch of iron plate for concert grandThumbnailsItalian SpinetSketch of iron plate for concert grandThumbnailsItalian SpinetSketch of iron plate for concert grandThumbnailsItalian Spinet

A. Continuous bent rim.
B. Wooden struts.
C. Iron shoe holding struts and connecting with iron plate.
D. Main beam.