ファイル:Exploding pottery caltrops.jpgDescriptionExploding pottery caltrops.jpg English: Three hollow pottery caltrops that would have been filled with gunpowder. 13th - 14th century, possibly
ファイル:Xixia Museum caltrop.jpgAttribution-Share Alike 3.0 truetrue English Polish It's a pottery grenade, and not a caltrop. author name string: BabelStone URL: https://commons.wikimedia
ファイル:Ming exploding caltrops (1).jpgDescriptionMing exploding caltrops (1).jpg English: Ming dynasty pottery exploding caltrops (filled with gunpwder). From Ji County, Tianjin. Held at the
ファイル:Ming exploding caltrops (2).jpgDescriptionMing exploding caltrops (2).jpg English: Ming dynasty pottery exploding caltrops (filled with gunpwder). From Ji County, Tianjin. Held at the