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2. Hook-and-loop fastener - Wikipedia

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

   3M Dual Lock RFID transponder attached to car with hook-and-loop fastener The Slidingly Engaging Fastener was developed to address several problems with common hook-and-loop fasteners. [ 15 ] [ 16 ] Heavy-duty variants (such as "Dual Lock" or "Duotec") feature mushroom-shaped stems on each face of the fastener, providing an audible snap when ...

3. Two-person rule - Wikipedia

   en.wikipedia.org/wiki/Two-person_rule

   The simplest form of dual key security is a lock that requires two keys to open, with each key held by a different person. The lock can only be opened if both parties agree to do so at the same time. In 1963, Canada accepted having American W-40 nuclear warheads under dual key control on Canadian soil, to be used on the Canadian BOMARC missiles.

4. Combination lock - Wikipedia

   en.wikipedia.org/wiki/Combination_lock

   A Wordlock letter combination lock.. A combination lock is a type of locking device in which a sequence of symbols, usually numbers, is used to open the lock. The sequence may be entered using a single rotating dial which interacts with several discs or cams, by using a set of several rotating discs with inscribed symbols which directly interact with the locking mechanism, or through an ...

5. Time-delay combination locks - Wikipedia

   en.wikipedia.org/wiki/Time-delay_combination_locks

   Modern time delay combination locks can have many functions such as multiple different codes, pre-set time lock settings (open and close times), pre-set vacation times (e.g. Christmas Day), dual code facility, and a full audit trail providing a detailed record of the lock history showing who opened the lock, when and how long it was open. [3] [4]

6. IDC (electrical connector) - Wikipedia

   en.wikipedia.org/wiki/IDC_(electrical_connector)

   Two ribbon cables: the grey cable is stripped, and the rainbow cable has an IDC connector Connector blades IDC D-sub connectors DE-9 (male) and DA-15 (female) Connector blades cut insulation into the ribbon cable Australian (dual) power outlet, utilizing insulation displacement to connect mains voltage (230 V) supply conductors

7. Optical fiber connector - Wikipedia

   en.wikipedia.org/wiki/Optical_fiber_connector

   Optical fiber connectors are used to join optical fibers where a connect/disconnect capability is required. Due to the polishing and tuning procedures that may be incorporated into optical connector manufacturing, connectors are often assembled onto optical fiber in a supplier's manufacturing facility.