edge in the front part near the tip. Literature Toshiro Suga: Ken, die Wurzeln des Aikido / Ken, les racines de l'Aïkido von Toshiro Suga (DVD). Hagenow Ondefo-Verl., 2006, ISBN 978-3-939703-40-2. See also Japanese sword mountings References Ancient swords of Japan Japanese swords