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  2. Platform screen doors - Wikipedia

    en.wikipedia.org/wiki/Platform_screen_doors

    The idea of platform edge doors dates from as early as 1908, when Charles S. Shute of Boston was granted a patent for "Safety fence and gate for railway-platforms". [2] The invention consisted of "a fence for railway platform edges", composed of a series of pickets bolted to the platform edge, and vertically movable pickets that could retract ...

  3. Synthetic fence - Wikipedia

    en.wikipedia.org/wiki/Synthetic_fence

    A horse behind a vinyl fence of flexible "rail" and coated wire. A synthetic fence, plastic fence or (when made of vinyl) vinyl or PVC fence is a fence made using synthetic plastics, such as vinyl , polypropylene, [1] nylon, [2] polythene (polyethylene) ASA, or from various recycled plastics. Composites of two or more plastics can also be used ...

  4. Barbed wire - Wikipedia

    en.wikipedia.org/wiki/Barbed_wire

    An example of the costs of fencing with lumber immediately prior to the invention of barbed wire can be found with the first farmers in the Fresno, California, area, who spent nearly $4,000 (equivalent to $105,000 in 2024) to have wood for fencing delivered and erected to protect 2,500 acres (1,000 ha) of wheat crop from free-ranging livestock ...

  5. Perimeter fence - Wikipedia

    en.wikipedia.org/wiki/Perimeter_fence

    Demarcation of a perimeter, when the protection of assets, personnel or buildings is required, is normally affected by the building of a perimeter fence system. The level of protection offered varies according to the threat level to the perimeter. Different types of perimeter fencing include: Chain-link fencing; Metal railings; Palisade fencing

  6. Geofence - Wikipedia

    en.wikipedia.org/wiki/Geofence

    Two geofences defined in a GPS application. A geofence is a virtual "perimeter" or "fence" around a given geographic feature. [1] A geofence can be dynamically generated (as in a radius around a point location) or match a predefined set of boundaries (such as school zones or neighborhood boundaries).

  7. Fencing - Wikipedia

    en.wikipedia.org/wiki/Fencing

    This makes it much less expensive to provide classes, and thus easier to take fencing to a wider range of schools than traditionally has been the case. There is even a competition series in Scotland – the Plastic-and-Foam Fencing FunLeague [9] – specifically for Primary and early Secondary school-age children using this equipment.

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