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2. Door closer - Wikipedia

   en.wikipedia.org/wiki/Door_closer

   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. Door closers can be linked to a building's fire and security alarm systems. [2]

3. Door furniture - Wikipedia

   en.wikipedia.org/wiki/Door_furniture

   Manual door closer. Design of door furniture is an issue to disabled persons who might have difficulty opening or using some kinds of door, and to specialists in interior design as well as those usability professionals which often take their didactic examples from door furniture design and use. [1]

4. Swing-door operator - Wikipedia

   en.wikipedia.org/wiki/Swing-door_operator

   Some are built on top of a standard door closer. To open the door, the operator forces the closer in the opening direction. Then, the closer closes the door. The user may open the door manually, using just the door closer. In case of power failure while the door is open, the closer itself closes the door. Some are built without a door closer.

5. Category:Door furniture - Wikipedia

   en.wikipedia.org/wiki/Category:Door_furniture

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6. Door loop - Wikipedia

   en.wikipedia.org/wiki/Door_loop

   Electrically controlled door closer which receives electricity via a (visible) door loop. A door loop or door cord [1] is a mechanical device which provides a robust guideway for cabling between a swing door (the "door leaf") and a door frame. Door loops are described in the NFPA 80 standard for fire doors. [1] [2]

7. Economic history of the United States - Wikipedia

   en.wikipedia.org/wiki/Economic_history_of_the...

   The coming of the steamboat after 1810 made upstream traffic economical on major rivers, especially the Hudson, Ohio, Mississippi, Illinois, Missouri, Tennessee, and Cumberland rivers. [9]: 15–73 Historian Richard Wade has emphasized the importance of the new cities in the Westward expansion in settlement of the farmlands. They were the ...