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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. Low-floor tram - Wikipedia

    en.wikipedia.org/wiki/Low-floor_tram

    Wheelchair access ramp in Protram 205 WrAs tram. Low floor is approximately 360 mm (14 in) high. Some public transport companies have both low floor and high floor trams. They report that low floor trams have 15% higher maintenance costs for the rolling stock, and 20% higher maintenance costs for the infrastructure on average. [2]

  4. Wicket gate - Wikipedia

    en.wikipedia.org/wiki/Wicket_gate

    In the Middle Ages the narrow doors in the city walls also enabled late arrivals to gain entry after the main gates had been closed. [ 1 ] If the small entrance in the door of a large gate has a high threshold , it may be called a manway.

  5. The front door, threshold of welcome — and perilous border

    www.aol.com/front-door-threshold-welcome...

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  6. Elevated entrance - Wikipedia

    en.wikipedia.org/wiki/Elevated_entrance

    The door frames are usually very plain, but sometimes beading is used to decorate the frame. Coats of arms and the year of construction date to no earlier than the Late Middle Ages. Wooden entrance doors were sometimes clad with iron or slate in order to reduce the risk of fire. Original doors from the Middle Ages have rarely survived however.

  7. Sliding door - Wikipedia

    en.wikipedia.org/wiki/Sliding_door

    A groove is cut into the bottom of the door which runs over this guide, preventing lateral movement of the door. With a glass door, the panel runs through the guide as illustrated. Because the door is always engaged in the guide, when the door is open, the floor is clear; hence 'clear threshold'. The bottom of the doors are held in place on tracks.

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