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2. Invisible Fence Inc. - Wikipedia

   en.wikipedia.org/wiki/Invisible_Fence_Inc.

   Invisible Fence Inc. (commonly referred to as Invisible Fence Brand) is a company that designs radio pet fences for cats and dogs. Manufactured and distributed by Radio System Corporation, the company sells wireless and fenceless systems that were first introduced in 1973. [ 1 ]

3. Pet fence - Wikipedia

   en.wikipedia.org/wiki/Pet_fence

   A pet fence or radio fence, is an electronic system designed to keep a pet or other domestic animal within a set of predefined boundaries without the use of a physical barrier. A mild electric shock is delivered by an electronic collar if its warning sound is ignored.

4. Pest-exclusion fence - Wikipedia

   en.wikipedia.org/wiki/Pest-exclusion_fence

   A pest-exclusion fence is a barrier that is built to exclude certain types of animal pests from an enclosure. This may be to protect plants in horticulture , preserve grassland for grazing animals, separate species carrying diseases ( vector species ) from livestock, prevent troublesome species entering roadways, or to protect endemic species ...

5. Electric fence - Wikipedia

   en.wikipedia.org/wiki/Electric_fence

   A "stun–lethal" fence may also consist of two fences; one set of wires forming a conventional pulsed DC non-lethal fence, the second set (interleaved with the first) forming a 6.6 kV AC lethal fence, energized when the DC fence detects an intruder. Alternatively it may consist of a single, AC or pulsed DC fence capable of running in "safe ...

6. Talk:Pet fence - Wikipedia

   en.wikipedia.org/wiki/Talk:Pet_fence

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7. 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).