About ONO HIDENORI
About KAWAMURA SEISHI
About MIKAMI TAKAMASA
About YOKOYAMA YUTAKA
About TAKAHASHI HIROKI
About SAWADA TETSUNORI
About 北海道林試
About junior high school
About Sports
About facility and building
About floor
About Safety
About JIS
About buffer action
About elasticity (mechanical property)
About attenuation
About hardness
About martial arts
About mechanical property
About 道場
About elastic behavior
About Educational facilities,cultural facilities,religious buildings
About Floors,ceilings
About 武道
About 床
About 安全性
About 期待
About 中学校