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  2. Sandpaper - Wikipedia

    en.wikipedia.org/wiki/Sandpaper

    Examples of sanding discs using a quick-change mounting system. A quick-change system is commonly used with disc-type coated abrasives. A plastic or metal hub is bonded to one of the faces, which is threaded. This then mates directly to the sander or angle grinder or to a mandrel that can be mounted in a sander, grinder, or drill. The advantage ...

  3. Hook-and-loop fastener - Wikipedia

    en.wikipedia.org/wiki/Hook-and-loop_fastener

    Hook-and-loop fasteners, commonly known as Velcro (a genericized trademark), hook-and-pile fasteners or touch fasteners are versatile fastening devices that allow two surfaces to be repeatedly attached and detached with ease. Invented in the mid-20th century, they are widely used in clothing, accessories, and various industrial and consumer ...

  4. Crown block - Wikipedia

    en.wikipedia.org/wiki/Crown_block

    A crown block is the stationary section of a block and tackle that contains a set of pulleys or sheaves through which the drill line (wire rope) is threaded or reeved and is opposite and above the traveling block.

  5. Disc harrow - Wikipedia

    en.wikipedia.org/wiki/Disc_harrow

    A disc harrow is the preferred method of incorporating both agricultural lime (either dolomitic or calcitic lime) and agricultural gypsum, and disc harrowing achieves a 50/50 mix with the soil when set correctly, thereby reducing acid saturation in the top soil and so promoting strong, healthy root development.

  6. Tueller Drill - Wikipedia

    en.wikipedia.org/wiki/Tueller_Drill

    The Tueller Drill combines both parts of the original time trials by Tueller. There are several ways it can be conducted: [6] The (simulated) attacker and shooter are positioned back-to-back. At the signal, the "attacker" sprints away from the shooter, and the shooter unholsters his gun and shoots at the target 21 feet (6.4 m) in front of him.

  7. Cryptex - Wikipedia

    en.wikipedia.org/wiki/Cryptex

    In "Down the Rabbit Hole", a fourth season episode of the American TV series The Vampire Diaries, depicts a sword with a cryptex under its hilt. [ citation needed ] In "The Blame Game", a Season 8 episode of the American TV series Castle , one of the puzzles the characters need to solve involves a cryptex.