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Road marker magnetizing method
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Patent number 6,378,772
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Issue date Apr 30, 2002
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Public Works Research Institute
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Ryugen Yonemura
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G06 - COMPUTING CALCULATING COUNTING
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Bumping prevention system
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Patent number 6,360,171
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Issue date Mar 19, 2002
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Public Works Research Institute, Ministry of Construction
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Kazumasa Miyamoto
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G08 - SIGNALLING
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Anaerobic digestion method
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Patent number 4,985,149
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Issue date Jan 15, 1991
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Public Works Research Institute, Ministry of Construction
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Yoshio Ohshima
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE