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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

    An underground fence is an electronic system to prevent pets from leaving a yard. A buried wire around the containment area emits a radio signal to activate the receiver collar. A shock collar on the pet receives these signals. When the pet approaches the buried fence line, the collar makes a warning sound and then gives the pet a harmless ...

  4. Eruv - Wikipedia

    en.wikipedia.org/wiki/Eruv

    A fence being used as an eruv boundary in Israel The eruv typically includes numerous private homes, as well as a semi-public courtyard whose ownership is shared by them. To enact the merger of the homes and courtyard into a single domain, all home owners as well as owners of the courtyard must pool together certain foodstuffs, which grants the ...

  5. Electric fence - Wikipedia

    en.wikipedia.org/wiki/Electric_fence

    A piggyback electric fence is mounted off the back of an existing wire or mesh fence, adding another level of security to the existing perimeter barrier. The piggyback profile is fastened to existing fence posts (e.g. pillars of a palisade fence) using rivets or screws. These are the most commonly used security electric fences. Wall top

  6. Ha-ha - Wikipedia

    en.wikipedia.org/wiki/Ha-ha

    Comparison of a ha-ha (top) and a regular wall (bottom). Both walls prevent access, but one does not block the view looking outward. A ha-ha (French: hâ-hâ [a a] ⓘ or saut de loup [so də lu] ⓘ), also known as a sunk fence, blind fence, ditch and fence, deer wall, or foss, is a recessed landscape design element that creates a vertical barrier (particularly on one side) while preserving ...

  7. Chain-link fencing - Wikipedia

    en.wikipedia.org/wiki/Chain-link_fencing

    Chain-link fencing showing the diamond patterning A chain-link fence bordering a residential property. A chain-link fence (also referred to as wire netting, wire-mesh fence, chain-wire fence, cyclone fence, hurricane fence, or diamond-mesh fence) is a type of woven fence usually made from galvanized or linear low-density polyethylene-coated steel wire.

  8. Cable locator - Wikipedia

    en.wikipedia.org/wiki/Cable_locator

    A cable locator or cable avoidance tool (CAT) is an instrument used for detecting the presence and approximate location of buried services in advance of undertaking excavation works. It aims to avoid accidents while excavating. [ 1 ]

  9. Cable fault location - Wikipedia

    en.wikipedia.org/wiki/Cable_fault_location

    Murray loop test employs the principle of wheatstone bridge for locating the fault. To perform this test, it is necessary to have a sound cable running alongside the faulty cable. One end of the faulted cable is connected through a pair of resistors to the voltage source. Also a null detector is connected. The other end of the cable is shorted.

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