Assisted opening systems have been pioneered by makers like Ken Onion with his "Speed-Safe" mechanism and Ernest Emerson's Wave system, where a hook catches the user's pocket upon removal and the blade is opened during a draw.
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Similar to the Swiss Army knife is the German Army knife, with two blades opening from each side and featuring hard plastic grips and aluminum liners.
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Patterson returned to Eighth United States Army base to meet his friend and changed pants then burned his blood stained clothes and threw away the pocket knife used for murder.