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Doors in a bypass unit overlap slightly when viewed from the front so they do not have a visible gap when closed. Doors which slide inside a wall cavity are called pocket doors. This type of door is used in tight spaces where privacy is also required. The door slab is mounted to roller and a track at the top of the door and slides inside a wall.
A M3 Scout Car showing the wide unditching roller at the front. The unditching roller is a device fitted to the front of military vehicles, such as the M3 Scout Car [1] and the M3 half-track, for the purpose of preventing the vehicle from getting stuck in an obstacle, such as a ditch.
Unlike most of the other German half-tracks, the Sd.Kfz. 8 was mostly used as a tractor for heavy artillery pieces and was generally not modified for other roles (apart from the few anti-tank conversions mentioned above). [18] The intended towed guns were the 15 cm Kanone 16; the 15 cm Kanone 18; the 10.5 cm FlaK 38, and the 21 cm Mörser 16. [19]
A typical single-car garage roller door has a preloaded spring inside the rolling mechanism. The spring reduces the effort required to open the door. Oversized roller doors in commercial premises are not sprung (except in the US), and a manual pulley and chain system or a geared motor is used to raise and lower (roll up and roll down) the door ...
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The site in Karlskrona opened in 1960, which made heavy rollers and had the company's technical centre. The CA 25 road roller introduced in 1970 became the world's leading compaction roller. It changed its name to Dynapac Maskin AB in 1973; at this moment the company rapidly expanded its product range.
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