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Ultrasonic flaw detector
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Patent number 5,117,697
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Issue date Jun 2, 1992
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Hitachi Construction Machinery Co., Ltd.
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Yoshihiko Takishita
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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Ultrasonic flaw detecting system
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Patent number 5,042,305
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Issue date Aug 27, 1991
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Hitachi Construction Machinery Co., Ltd.
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Yoshihiko Takishita
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B82 - NANO-TECHNOLOGY
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Supersonic flaw detecting system
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Patent number 4,768,155
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Issue date Aug 30, 1988
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Hitachi Construction Machinery Co., Ltd.
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Yoshihiko Takishita
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B82 - NANO-TECHNOLOGY