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The pocket grappling hook was originally built by EOD Robotics, Inc. at the request of a desert warfare operator. He explained his need for a light

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Wrist-Mounted Grappling Hook 1.1 │ A wacky, but versatile

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Helix Operations – Tactical – Grapnel Launchers

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Grappling Hook Launcher : 15 Steps (with Pictures) - Instructables

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Grappling Hook Launcher : 15 Steps (with Pictures) - Instructables