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These knife combs, "Comb-at" designed by Lorenzo Damiani and "Combmando" by Studiobo.both combs, were made for personal defense.
You can keep it where you want, like in your bag. It is undoubtedly a great help to anyone who is assaulted, or just for scare your friends!
Source link: http://www.topblogposts.com/2009/04/knife-combs/