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2. Door - Wikipedia

   en.wikipedia.org/wiki/Door

   Steel doors are another major type of residential front doors; most of them come with a polyurethane or other type of foam insulation core – a critical factor in a building's overall comfort and efficiency. Steel doors mostly in default comes along with frame and lock system, which is a high cost efficiency factor compared to wooden doors.

3. Mantrap (access control) - Wikipedia

   en.wikipedia.org/wiki/Mantrap_(access_control)

   Entrance to HM Prison Edinburgh. A mantrap, security mantrap portal, airlock, sally port or access control vestibule is a physical security access control system comprising a small space with two sets of interlocking doors, such that the first set of doors must close before the second set opens.

4. Stainless steel - Wikipedia

   en.wikipedia.org/wiki/Stainless_steel

   Stainless steel, also known as inox, corrosion-resistant steel (CRES), and rustless steel, is an iron-based alloy containing a minimum level of chromium that is resistant to rusting and corrosion. Stainless steel's resistance to corrosion results from the 10.5%, or more, chromium content which forms a passive film that can protect the material ...

5. Access control - Wikipedia

   en.wikipedia.org/wiki/Access_control

   When access is denied based on the access control list, the door remains locked. If there is a match between the credential and the access control list, the control panel operates a relay that in turn unlocks the resource. The control panel also ignores an opening signal to prevent an alarm.

6. Devil's door - Wikipedia

   en.wikipedia.org/wiki/Devil's_door

   In a 2023 study, historian Geoffrey Sedlezky argues that the idea of a devil's door is a late 19th-century invention. Although the idea refers to medieval liturgical practices, the assumption that the northern church door was associated with the devil is a retrospective reconstruction, largely fuelled by 19th-century preoccupation with the ...

7. Custom online panel - Wikipedia

   en.wikipedia.org/wiki/Custom_online_panel

   A panel can range in size from 100 to 100,000 or more people. Larger panels can enable surveys of smaller target groups. Panel quality is not determined solely by size, however, and how panel members have been sourced is also important. [1] Panels can provide a dedicated group that market researchers can engage with and learn from over time.