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Improvements in or relating to Pianoforte Actions.
Improvements in or relating to Pianoforte Actions.
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机译:钢琴演奏动作或与之相关的改进。
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129,419. Chappell & Co., and Pevier, W. C. July 6, 1918. Actions, horizontal. A spring F is interposed between the main action lever A and the rail C and is adjustable by means of a screw G to regulate the touch,
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