A tool called spindle whorl was discovered in the ruins from the 4th century BC to the middle of the 3rd century BC. From the Kamakura period to the Southern and Northern Dynasties (Vietnam), the family of Nitta (Oida, etc.) of Kozuke Country entered and ruled-Akashi Tokamachi shrinkage, Cicada wing (Possible to exert a strong bactericidal action against Pseudomonas aeruginosa that causes respiratory infections, urinary tract infections, sepsis, etc. in people with reduced resistance. Capillarity ≒ h: Liquid level rise height [m] , T: Surface tension [N / m], θ: Contact angle [°], ρ: Liquid density [kg / m3], g: Gravity acceleration [m / s2], r: Tube radius [m])

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