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1997-07-23
Arrangement of composite piezoelectric transducers having improved acoustic and electrical impedance
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Piezoelektrischer elektroakustischer Wandler
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2004-07-08
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1998-05-15
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1988-10-13
JPH0323728Y2
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1991-05-23
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1987-05-12
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1993-08-10
目覚ましシート
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1986-09-12
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1991-10-11
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1990-12-11
JPH0159393U
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1989-04-13
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1986-11-17
JPS6388311U
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1988-06-08
JPH02883U
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1990-01-05
JPS6417483U
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1989-01-27
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1987-02-20
JPH0443277U
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1992-04-13
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1995-05-27
Электроакустический преобразователь
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1990-08-17
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1992-04-13
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1990-08-07
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1989-03-01
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1987-11-13