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2. Door closer - Wikipedia

   en.wikipedia.org/wiki/Door_closer

   A door closer is a mechanical device that regulates the speed and action of a door’s swing. [1] Manual closers store the force used to open the door in some type of spring and reuse it to close the door. Automatic types use electricity to regulate door swing behavior. Door closers can be linked to a building's fire and security alarm systems. [2]

3. Chain-link fencing - Wikipedia

   en.wikipedia.org/wiki/Chain-link_fencing

   Chain-link fencing showing the diamond patterning A chain-link fence bordering a residential property. A chain-link fence (also referred to as wire netting, wire-mesh fence, chain-wire fence, cyclone fence, hurricane fence, or diamond-mesh fence) is a type of woven fence usually made from galvanized or linear low-density polyethylene-coated steel wire.

4. Real-estate lock box - Wikipedia

   en.wikipedia.org/wiki/Real-estate_lock_box

   A realtor lock box hanging on the doorknob of a house for sale A real-estate lock box is a padlock -shaped box that generally hangs around the doorknob of a house that is on the market . The device holds the keys to a house to allow communal access for all real estate agents , while continuing to keep them secure. [ 1 ]

5. Door chain - Wikipedia

   en.wikipedia.org/wiki/Door_chain

   A door chain, security chain, or security door chain or chain door interviewer [1] consists of a small chain attached to the door frame, which attaches to a track on the door for security purposes. It is a type of lock that is often used along with other types of locks to secure a door. [ 2 ]

6. Handcuff cover - Wikipedia

   en.wikipedia.org/wiki/Handcuff_cover

   It consists of a hinged, box-like assembly locked over the handcuff chain, wristlets and keyholes. [1] The first handcuff cover was invented by J. D. Cullip and K. E. Stefansen [2] and patented in 1973. [3] It is made from high-strength, high-impact ABS plastic [4] and is still distributed by C & S Security Inc. as "Black Box" handcuff cover. [5]

7. Swing-door operator - Wikipedia

   en.wikipedia.org/wiki/Swing-door_operator

   Some are built on top of a standard door closer. To open the door, the operator forces the closer in the opening direction. Then, the closer closes the door. The user may open the door manually, using just the door closer. In case of power failure while the door is open, the closer itself closes the door. Some are built without a door closer.