An interesting Offer from Kershaw the idea was to accommodate those who wanted an auto but could'nt have one legally so they came up with this as a solution. Its called the Kershaw Lever The Idea is you push the lever down and it exteacts the blade open about 15 degrees then you flick your wrist to deploy it. it is a an appealing knife but this was one of the offering largly ignored by the knife buying public due to much better offerings and the coming of knife designer knives to see this blade in action check out the link below

Kershaw Lever 4510ST Japanese Design
Link: https://www.youtube.com/watch?v=-LG12oVEPxY