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2. Threshold (architecture) - Wikipedia

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

   A worn-out wooden threshold. A threshold is the sill of a door. Some cultures attach special symbolism to a threshold. It is called a door saddle in New England. [citation needed] Door thresholds cover the gap between the floor and the door frame, helping to prevent any water leaks, insects or draughts from entering through the opening.

3. Door - Wikipedia

   en.wikipedia.org/wiki/Door

   Sill (for exterior doors) – A horizontal sill plate below the door that supports the door frame. Similar to a window sill but for a door; Threshold (for exterior doors) – A horizontal plate below the door that bridges the crack between the interior floor and the sill.

4. Plug door - Wikipedia

   en.wikipedia.org/wiki/Plug_door

   The MVG Class A of the Munich U-Bahn uses sliding plug doors.. Many passenger trains in the world use sliding plug doors: early examples of passenger trains using plug doors include the MVG Class A of the Munich U-Bahn from 1967, [3] the first batch of trains for Line 2 of the Milan Metro from 1970, [4] and the DT1 of the Nuremberg U-Bahn, also from 1970.

5. Alaska blowout Q&A: What's a door plug? How does an ... - AOL

   www.aol.com/news/why-planes-door-plugs-other...

   What's a 'door plug' and why do airliners have them? How does a smartphone still work after falling three miles? We have answers to these and other questions stemming from Alaska Flight 1282.

6. Sliding door (car) - Wikipedia

   en.wikipedia.org/wiki/Sliding_door_(car)

   Sliding plug doors on a bus have pantographic hinges that move the door panel outwards from its plug socket and then parallel to the side of the bus to clear the opening. On closing, the door is wedged and locked into the opening. This arrangement makes a very good airtight and soundproof seal and is commonly found on coaches.

7. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!