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2. Self-locking device - Wikipedia

   en.wikipedia.org/wiki/Self-locking_device

   Self-locking devices are pieces of rock-climbing equipment intended to arrest the fall of solo climbers who climb without partners. This device is used for rope solo climbing , for "ground-up climbing", and for " top rope solo climbing ".

3. Padlock - Wikipedia

   en.wikipedia.org/wiki/Padlock

   Padlocks with modular locking mechanisms can often be taken apart to change the tumblers or to service the lock. Modular locking mechanism cylinders frequently employ pin, wafer, and disc tumblers. Padlocks with modular mechanisms are usually automatic, or self-locking (that is, the key is not required to lock the padlock)

4. Rotary combination lock - Wikipedia

   en.wikipedia.org/wiki/Rotary_combination_lock

   The dial is connected to an internal mechanism, usually containing three separate wheels with notches, called gates. Each wheel must be aligned to allow a fence to drop into the gates, releasing the lever that holds the lock in place, allowing the lock to open. Generally, this is accomplished by moving the dial to three (or more) positions ...

5. Bachmann knot - Wikipedia

   en.wikipedia.org/wiki/Bachmann_knot

   It is useful when the friction hitch needs to be reset quickly or often or made to be self-tending as in crevasse and self-rescue. (See Prusik knot) The Bachmann hitch requires the use of a carabiner. It does not matter if the carabiner is locking or not. Most importantly, the carabiner must be of round cross section for friction.

6. Frank J. Mafera - Wikipedia

   en.wikipedia.org/wiki/Frank_J._Mafera

   Mafera's brother already owned a chain-link fence company in Medford, Massachusetts, [2] and Mafera's 1931 patent was one of the several advancements made by the Maferas in the development of chain-link fencing. Mafera first sold the fencing from his house in Raymond, New Hampshire, under the name of the Barnyard Fence Company.

7. Chain - Wikipedia

   en.wikipedia.org/wiki/Chain

   Chain-linked lewis, a self-locking lifting device particularly for stone using a chain link as a pivot; Curb chain, used on curb bits when riding a horse; High-tensile chain (or transport chain), chain with a high tensile strength used for towing or securing loads; Jack chain, a toothed chain used to move logs