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The BL 6-inch Mk XXII gun [note 1] was a British high-velocity 6-inch 50-calibre wire-wound naval guns deployed on the Nelson-class battleships from the 1920s to 1945.
The Model 1914 grenade (Russian: Ручная граната образца 1914 года, romanized: Ruchnaya granata obraztsa 1914 goda, lit. 'Hand Grenade Pattern of year 1914') is a Russian stick concussion grenade (fragmentation grenade via an optional jacket) that was used during World War I and World War II.
A general practice is to size the sleeve two NPS (pipe sizes) up from the diameter of the penetrant. For example, a 4" pipe, with 1" of thermal insulation makes a 6" penetrant (1" pipe covering on each side of the pipe), plus two pipe sizes = an 8" sleeve, creating a 1" annulus.
Bollards are used to protect buildings and people in public spaces from car ramming attacks [21] and accidental collisions. Related protections against deliberate attacks are wedge barriers and archer barriers. [22] The bollards are effective protection against deliberate attacks if properly deployed and maintained.
Delineators are tall pylons (similar to traffic cones or bollards) mounted on the road surface, or along the edge of a road, and are used to channelize traffic. These are a form of raised pavement marker but unlike most such markers, delineators are not supposed to be hit except by out-of-control or drifting vehicles.
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