DE516456C
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Lighting device for grand pianos and other keyboard instruments
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DE463888C
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Electric lighting device for musical instruments
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DE440834C
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Lighting device on keyboard instruments
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DE435585C
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Lighting device for grand pianos and other keyboard instruments
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DE419249C
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Lighting device on keyboard instruments
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DE459359C
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Lighting device for grand pianos and other keyboard instruments
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DE431552C
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Electric game device for keyboard instruments
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DE332620C
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Mechanically playing hand for keyboard instruments, especially for advertising purposes
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