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  2. Arrow lock - Wikipedia

    en.wikipedia.org/wiki/Arrow_lock

    Arrow lock. An arrow lock is a lock with standard dimensions used by the United States Postal Service for mail carriers to access collection boxes, outdoor parcel lockers, cluster box units, and apartment mailbox panels. Arrow locks are unlocked through the use of a corresponding arrow key. Arrow locks are also referred to as "Master Access ...

  3. Lock and key - Wikipedia

    en.wikipedia.org/wiki/Lock_and_key

    Lock and key. A typical modern padlock and its keys. A lock is a mechanical or electronic fastening device that is released by a physical object (such as a key, keycard, fingerprint, RFID card, security token or coin), by supplying secret information (such as a number or letter permutation or password ), by a combination thereof, or it may only ...

  4. Letter box - Wikipedia

    en.wikipedia.org/wiki/Letter_box

    Styles and usage. A "letter box", or "mail slot" in American and Canadian usage, is a slot, usually horizontal but sometimes vertical, about 30 cm by 5 cm (12 inches by 2 inches), cut through the middle or lower half of a front door. This style is almost universal in British homes and offices, but in the US is limited primarily to urban areas.

  5. Faraday cage - Wikipedia

    en.wikipedia.org/wiki/Faraday_cage

    Faraday cage. A Faraday cage or Faraday shield is an enclosure used to block some electromagnetic fields. A Faraday shield may be formed by a continuous covering of conductive material, or in the case of a Faraday cage, by a mesh of such materials. Faraday cages are named after scientist Michael Faraday, who first constructed one in 1836.

  6. Three Lock Box - Wikipedia

    en.wikipedia.org/wiki/Three_Lock_Box

    Three Lock Box is the seventh studio album by the American rock vocalist Sammy Hagar, released on December 6, 1982 by Geffen Records. This album has appearances by Loverboy 's Mike Reno, Journey 's Jonathan Cain and Mr. Mister 's Richard Page. It peaked at number 17 on the Billboard 200 album charts on April 9, 1983. [ 3]

  7. Mortise lock - Wikipedia

    en.wikipedia.org/wiki/Mortise_lock

    Mortise lock. The two main parts of a mortise lock. Left: the lock body, installed in the thickness of a door. This example has two bolts: a sprung latch at the top, and a locking bolt at the bottom. Right: the box keep, installed in the doorjamb. A mortise lock (also spelled mortice lock in British English) is a lock that requires a pocket ...

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