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2. Revolving door - Wikipedia

   en.wikipedia.org/wiki/Revolving_door

   Revolving door is flanked on both sides by conventional doors with arrows pointing inward towards the preferred entry. H. Bockhacker of Berlin was granted German patent DE18349 [ 7 ] on December 22, 1881 for Tür ohne Luftzug or ' Door without draft of air ' , which used a rotating cylinder with a door which after entering, the user then turned ...

3. Door - Wikipedia

   en.wikipedia.org/wiki/Door

   Steel doors are another major type of residential front doors; most of them come with a polyurethane or other type of foam insulation core – a critical factor in a building's overall comfort and efficiency. Steel doors mostly in default comes along with frame and lock system, which is a high cost efficiency factor compared to wooden doors.

4. Door breaching - Wikipedia

   en.wikipedia.org/wiki/Door_breaching

   Utilizing a breaching tool is unnecessary if the door is unlocked and easy to open. [5] [3] [6] [1] If the door is locked, breachers can attempt to force inward-opening doors with a strong kick. The breacher will aim to hit the door near the locking mechanism, but not kick the doorknob itself as one can easily twist an ankle doing so. [7]

5. Lintel - Wikipedia

   en.wikipedia.org/wiki/Lintel

   Structural lintel Lintel above a door in Paris. A lintel or lintol is a type of beam (a horizontal structural element) that spans openings such as portals, doors, windows and fireplaces. It can be a decorative architectural element, or a combined ornamented/structural item.

6. U.S. Steel faces murky future after proposed Nippon Steel ...

   www.aol.com/u-steel-faces-murky-future-220916581...

   U.S. Steel ranked 27th in the world based on output, and Nippon Steel ranks fourth, according to the World Steel Association. Tiger Bech's family on his final moments after New Orleans attack

7. AOL Mail

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   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!