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GB301985A
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Improvements in sounding devices for pianofortes and like stringed instruments
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US1777260A
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Sound device for stringed instruments
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GB218293A
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Improvement in metal sounding plate for musical instruments, other acoustic arrangements, and lecture-rooms
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US1534309A
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Metal sound board for pianos and the like
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GB188333A
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Improvements in metal sounding-boards for pianos
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US1611430A
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Metal sounding board for pianos
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US1440667A
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Metal sounding board for pianos
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AU775913B
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Improvements in means for stretching a resonant plate over a frame
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