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Why You Should Install a Hook Lock Hook locks stop thieves from stealing your van's contents by securing it to the vehicle door. reduce the risk of accidents on the job site caused by malfunctioning spring latches on standard sling hooks that fail to snap shut when not under load. This paper uses bifurcation and numerical continuation theories to analyze the motion properties of a hook lock mechanism. To optimize the unlocking force, the effects of the weight of the landing gear and
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