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Moving object detecting device
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Patent number 4,961,039
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Issue date Oct 2, 1990
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Matsushita Electric Works, Ltd.
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Kazumasa Yamauchi
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G01 - MEASURING TESTING
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Variable directivity mounting means
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Patent number 4,292,679
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Issue date Sep 29, 1981
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Matsushita Electric Works, Ltd.
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Mikio Kondo
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Ultrasonic wave horn
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Patent number 4,104,610
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Issue date Aug 1, 1978
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Matsushita Electric Works, Ltd.
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Hiromitsu Inoue
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G10 - MUSICAL INSTRUMENTS ACOUSTICS