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Self-adapting type turntable modulation dulcimer
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String array layout mechanism
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Automatic shift formula grand piano
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Instant parameter detecting mechanism
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Qin body numeral driving mechanism
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Soundboard iron rust analysis platform
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Autoclave depth of field resolution system
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Thermal insulative board mode switching system
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Air conditioning air outlet positioning system
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Safty electronic piano
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The desk-top piano of Multifunctional flat
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Assist the wooden piano of formula that oils
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