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Modern method og grand pianoforte case construction

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Modern method og grand pianoforte case construction.png Standard American upright actionMiniaturesGrand pianoforte action with metallic action and damper framesStandard American upright actionMiniaturesGrand pianoforte action with metallic action and damper framesStandard American upright actionMiniaturesGrand pianoforte action with metallic action and damper framesStandard American upright actionMiniaturesGrand pianoforte action with metallic action and damper framesStandard American upright actionMiniaturesGrand pianoforte action with metallic action and damper framesStandard American upright actionMiniaturesGrand pianoforte action with metallic action and damper frames

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