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Yoshio Akutsu
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Chiyoda, JP
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last 30 patents
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Patent Grant
Portable ultrasonic detector
Patent number
6,397,681
Issue date
Jun 4, 2002
Hitachi Construction Machinery Co., Ltd.
Hajime Mizunoya
G01 - MEASURING TESTING
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Patent Grant
Ultrasonic signal amplifier circuit and system of gain control thereof
Patent number
4,904,954
Issue date
Feb 27, 1990
Hitachi Construction Machinery Co., Ltd.
Kan Otake
G01 - MEASURING TESTING