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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 ]
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. The system was first invented and patented by Richard Peck in 1973. [1]
Nofence is a Norwegian company that makes GPS collars for farm animals (cattle, sheep, and goats) that discourage them from crossing virtual fences. [1] [2] Oscar Hovde Berntsen has been working on the idea of virtual fencing, as an alternative to fixed electric fencing, since the 1990s. [3] Nofence was incorporated in 2011. [3]
In a virtual electric fence system, each animal has a collar with a GPS unit which is set to produce first an audible warning and then a shock as the animal approaches a programmable boundary. Pet fences to control domestic dogs have been used since 1973, and the first system for livestock control was developed by Peck's Invisible Fence Co, now ...
A neck collar being placed on a patient by emergency services. A soft collar is fairly flexible and is the least limiting but can carry a high risk of further breakage, especially in people with osteoporosis. They are usually made of felt. It can be used for minor injuries or after healing has allowed the neck to become more stable. [citation ...
1961: Shortly after the Berlin Wall was erected in 1961, a Communist-run East Berlin radio station called Ops used “Don’t Fence Me In” as the theme song for its nightly broadcast aimed at Allied soldiers, based in West Berlin. [28] 1974: Used in the World War II documentary The World at War in an episode covering the American entry into war.
Rabbit-Proof Fence is a 2002 Australian epic drama film directed and produced by Phillip Noyce. It was based on the 1996 book Follow the Rabbit-Proof Fence by Doris Pilkington Garimara , an Aboriginal Australian author.
The flatworms "fence" using extendable two-headed dagger-like stylets. These stylets are pointed (and in some species hooked) in order to pierce their mate's epidermis and inject sperm into the haemocoel in an act known as intradermal hypodermic insemination, or traumatic insemination. Pairs can either compete, with only one individual ...
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