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1978-08-28 |
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1979-01-15 |
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1989-06-27 |
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2011-12-27 |
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2018-09-18 |
歌尔股份有限公司 |
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2015-08-11 |
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2019-06-04 |
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uBeam Inc. |
Piezoelectric transducer
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