I would like to add something to this thread.
Michael Walker (Mr. Liner Lock) is author of more than 20 blade-locking mechanisms. Together with Ron Lake he worked out Lake and Walker Knife Safety (LWKS) - the additional safety mechanism which prevents liner lock unintended disengagement. Columbia River Knife & Tool produces two new knives - Point Guard and Crawford/Kasper Folder - with this locking mechanism.
As to Michael Walker's production knives - SPYDERCO had in production Michael Walker custom collaboration C22 - sweet small folder in ATS-34, titanium and carbon fiber, pretty expensive collectible piece, numbered. It was limited edition and now the limit is over. I have the lightweight version with AUS-8 blade and Zytel handle - really cool design.
Some European manufacturers are also cooperating with Michael Walker: Boker (Solingen, Germany) has currently Walker's folder in production, H. P. Klotzli makes some Walker designed knives also.
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Sergiusz Mitin
gunwriter
Lodz, Poland