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2. National Register of Historic Places listings in Columbus, Ohio

   en.wikipedia.org/wiki/National_Register_of...

   This is a list of the National Register of Historic Places entries in Columbus, Ohio, United States.The National Register is a federal register for buildings, structures, and sites of historic significance.

3. Guard rail - Wikipedia

   en.wikipedia.org/wiki/Guard_rail

   Staircase railings in the Degré du roi, part of the Petit appartement du roi, in the Palace of Versailles, Versailles, France. Guard rails, guardrails, railings or protective guarding, [1] in general, are a boundary feature and may be a means to prevent or deter access to dangerous or off-limits areas while allowing light and visibility in a greater way than a fence.

4. Bolt snap - Wikipedia

   en.wikipedia.org/wiki/Bolt_snap

   The characteristic element of the bolt snap is the bolt action gate. This is a spring loaded rod which slides longitudinally inside the body of the clip against a compression spring to open the gate of the hook, and returns to rest against the tip of the hook by the action of the spring when released.

5. Swingnose crossing - Wikipedia

   en.wikipedia.org/wiki/Swingnose_crossing

   In addition, the open gap at a fixed V-crossing forms a weak point on the railway line where the heavily loaded wheel must bump across the resulting gap of about 10 cm (4 in), supported only by the portion of the wheel tread which is on the wing rail. This pounds the rail so much that the steel can deform and/or wear away.

6. Garage door - Wikipedia

   en.wikipedia.org/wiki/Garage_door

   The operating mechanism is usually spring-loaded or counterbalanced to offset the door's weight and reduce the human or motor effort required to operate the door. Less commonly, some garage doors slide or swing horizontally. Doors are made of wood, metal, or fiberglass, and may be insulated to prevent heat loss.

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!