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DE690716C
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Wing-like string instrument
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DE695056C
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Piano without a soundboard
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DE588465C
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Wing mechanism with device for playing the piano
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DE572489C
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Piano with several independent resonance floors
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DE536854C
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Keyboard instrument
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DE499970C
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Device for Raschel machines or flat warp knitting machines for the production of randomly scattered patterns
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DE413798C
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Quarter-tone piano
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DE413797C
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Quarter-tone grand piano
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DE418245C
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Keyboard for a quarter-tone keyboard instrument
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DE416710C
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Quarter-tone instrument with two resonance floors
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