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Published on Jun 2, 2009
Butterfly knives are illegal in some states due to their association with violence. Find out how butterfly knives can be useful for opening boxes and protecting the hand in someone's pocket with help from a grinding and knife sharpening specialist in this free video on butterfly knives.
Expert: Tom Warner & Mark Woodward Contact: www.llorenz.com Bio: Tom Warner has worked at Lorenz Grinding since 1960. Mark Woodward has been the owner of Lorenz Grinding for more than four years. Filmmaker: Michael Burton