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2. Cointet-element - Wikipedia

   en.wikipedia.org/wiki/Cointet-element

   A Cointet-element on a beach, rigged with explosive "sausages" by an American Underwater Demolition Team. Cointet-element at Collevill-sur-Mer. The Cointet-element, also known as a Belgian Gate or C-element, was a heavy steel fence about three metres (9 ft 10 in) wide and two metres (6 ft 7 in) high, typically mounted on concrete rollers, used as a mobile anti-tank obstacle during World War II ...

3. Portal (architecture) - Wikipedia

   en.wikipedia.org/wiki/Portal_(architecture)

   Doors, metal gates, or portcullis in the opening can be used to control entry or exit. The surface surrounding the opening may be made of simple building materials or decorated with ornamentation . The elements of a portal can include the voussoir , tympanum , an ornamented mullion or trumeau between doors, and columns with carvings of saints ...

4. MOSE - Wikipedia

   en.wikipedia.org/wiki/MOSE

   The gates consist of metal box-type structures 20 metres (66 ft) wide for all rows, with a length varying between 18.5 and 29 metres (61 and 95 ft) and from 3.6 to 5 metres (12 to 16 ft) thick. The gates are connected to the concrete housing structures with hinges, the technological heart of the system, which allow the gates to move while ...

5. Category:Types of gates - Wikipedia

   en.wikipedia.org/wiki/Category:Types_of_gates

   Doors (5 C, 64 P) T. Torii (5 P) Triumphal arches (2 C, 22 P) Pages in category "Types of gates" The following 47 pages are in this category, out of 47 total.

6. Guard stone - Wikipedia

   en.wikipedia.org/wiki/Guard_stone

   Obsolete cannons were often used as wheel guards in the Netherlands, such as for the Catherine's gate in Dordrecht. A guard stone, jostle stone or chasse-roue (French lit. "wheel chaser"), is a projecting metal, concrete, or stone exterior architectural element located at the corner and/or foot of gates, portes-cochères, garage entries, and walls to prevent damage from vehicle tires and wheels.

7. Door security - Wikipedia

   en.wikipedia.org/wiki/Door_security

   A metal doorframe with a strike plate built in: in other doors this would be a metal strikeplate in a wooden doorframe. The term door security or door security gate may refer to any of a range of measures used to strengthen doors against door breaching, ram-raiding and lock picking, and prevent crimes such as burglary and home invasions.