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Patents
Construction Work
北村精男, 石原行博, 尾川七瀬. 地質推定方法及び地質推定システム. JP2014-177826A.
Patents
Construction Work
北村精男, 石原行博, 板坂悠司. 杭打機及び杭打込方法. JP2013-160013A.
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