Locks....

Comp lock?
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Yep have two of other stule
 
I hope someone can help me with this. Among my knives is an early 2 bladed Sheffield jackknife with a locking main blade. Unlocking the blade requires the partial opening of the second blade. I have had this mechanism on other knives, even on some Leatherman multitools; but what is this type of locking mechanism called?

thanks.

n2s
 
Here are few folders with interesting locking mechanisms, in my collection :

G&G Hawk Strong Lock Systems (SLS)

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Buck 829 Legacy Collection Marksman Elite Flipper - 3.5" S90V Black Stonewashed Blade, Blue Aluminum Handles with CF Inlay

Button Lock

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Massdrop x Dew Hara Limited Edition Kabuto - 3.5" S35VN Blade, CF Handles with TI Liners

Scorpion Lock

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Cold Steel Demko AD-15 - 3.625" S35VN Blade, with OD Green G-10 Handles and Stainless Steel Liners

Here is a link to a site which documents some unique locking/opening mechanisms. I would love to add an original Barry Wood to my collection someday.
 
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