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1979-10-30 |
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1978-09-22 |
1980-03-26 |
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Preparation of copolymer
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Preparation of propylene copolymer
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Tsinghua University |
Thermoacoustic device
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清华大学 |
超声发声器
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2008-04-28 |
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2008-04-28 |
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Tsinghua University |
Ultrasonic thermoacoustic device
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清华大学 |
发声装置
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2008-08-22 |
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清华大学 |
音箱
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2008-10-08 |
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2008-10-08 |
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耳机
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