Folding knives
Folding knives, such as the lockback knife or claspknife have locking mechanism such as a twisting ring or catch that must be released in a distinct action before the knife can be folded. This lock improves safety by preventing accidental blade closure while cutting. In contrast, slipjoint knives rely only on a small sliding spring to keep the blade open, and if enough force is applied to the back of the knife, the blade will close.
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Folding knives
Lockable folging knives have appeared as early as the 15th century. In the late 19th century locking pocket knives were popularized and marketed on a wider scale.
Folding knife
In the 1990s in the United States, as a response to restrictive gun laws, tactical folding knives became popular. In response to the demand for folding knives, production companies offered mass-produced tactical folding knives. There has been criticism against the notion of a "Tactical Folding Knife". Students of knife-fighting point out that any locking mechanism can fail and that a folding knife regardless of lock strength can never be as reliable as a fixed-blade combat knife.