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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. Barbed wire - Wikipedia

   en.wikipedia.org/wiki/Barbed_wire

   In high soil-fertility areas where dairy cattle are used in great numbers, 5- or 7-wire fences are common as the main boundary and internal dividing fences. On sheep farms 7-wire fences are common with the second (from bottom) to fifth wire being plain wire. In New Zealand wire fences must provide passage for dogs since they are the main means ...

4. Perimeter fence - Wikipedia

   en.wikipedia.org/wiki/Perimeter_fence

   Chain-link fencing; Metal railings; Palisade fencing; Rolled mesh fencing; Timber fencing; Welded wire mesh fence fencing; Vertical bar fencing has been the most popular form of perimeter security fence since the 1980s. Since the 2000s, welded wire mesh and acoustic barriers have also become popular types of perimeter fence around the world.

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7. Electric fence - Wikipedia

   en.wikipedia.org/wiki/Electric_fence

   Typically, these fences are 2.4 metres (7 ft 10 in) tall and send high voltage electric pulses through the palisade at a frequency of 1 Hz (one pulse per second). Palisade electric fences are used in most countries, particularly where there is little vegetation to short-circuit the fence or where the costs of security personnel are high in ...