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When a car is submerged underwater, a hammer style glass breaker becomes significantly more difficult to use. While spring-loaded glass breakers can be convenient in some cases, most spring-loaded glass breakers are also limited to the amount of force the spring can deliver, [7] which could limit the user's ability to break tough glasses.
An exploded view of an automatic center punch. An automatic center punch is a hand tool used to produce a dimple in a workpiece (for example, a piece of metal). It performs the same function as an ordinary center punch but without the need for a hammer.
Some high-security safes use a tempered glass relocker. This has wires that lead from the glass to randomly located, spring-loaded bolts. If a penetrating drill or torch breaks the glass, the bolts are released, blocking retraction of the main locking bolts. A gas abrasive drill can sometimes be used to safely drill through a glass relocker.
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She also hired a designer for a hand-operated device to keep a windshield clear and had a local company produce a working model. Her device consisted of a lever inside the vehicle that controlled a rubber blade on the outside of the windshield. The lever could be operated to cause the spring-loaded arm to move back and forth across the windshield.
A sheath or hood slides over the needle after the injection is completed with a Needlestick Prevention Syringe, which also has a re-use prevention feature (either an auto disable mechanism or breaking plunger). Retractable syringes use either manual or spring-loaded retraction to withdraw the needle into the barrel of the syringe.
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A folding switchblade. A switchblade (also known as switch knife, automatic knife, pushbutton knife, ejector knife, flick knife, gravity knife, flick blade, or spring knife) is a pocketknife with a sliding or pivoting blade contained in the handle which is extended automatically by a spring when a button, lever, or switch on the handle or bolster is activated.