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2. Door closer - Wikipedia

   en.wikipedia.org/wiki/Door_closer

   Modern manual door closer Eclipse door spring and separate checking mechanism. 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.

3. Covered goods wagon - Wikipedia

   en.wikipedia.org/wiki/Covered_goods_wagon

   For covered wagons there was the Class A2 wagon with a 15 t (14.8 long tons; 16.5 short tons) maximum load and 21.3 m 2 (229 sq ft) loading area built to a standard template, and the large-volume covered wagon based on template A9, also with a 15 t (14.8 long tons; 16.5 short tons) maximum load, but a 21.3 m 2 (229 sq ft) loading area.