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2. Electric fence - Wikipedia

   en.wikipedia.org/wiki/Electric_fence

   In 1969 Robert B. Cox, a farmer in Adams County, Iowa, invented an improved electric fence bracket and was issued United States Patent No. 3,516,643 on 23 June 1970. This bracket improved electric fences by keeping the wire high enough above the ground and far enough away from the fence to permit grass and weeds growing beneath the wire to be ...

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. The system was first invented and patented by Richard Peck in 1973. [1]

4. 9 Expert-Approved Tips For Getting Rid Of Groundhogs - AOL

   www.aol.com/lifestyle/9-expert-approved-tips...

   Consider an electric wire. ... is another good option set at 4 to 5 inches above ground, says Anderson. ... Use 2-inch woven wire fence to screen off access under porches and decks.

5. Agricultural fencing - Wikipedia

   en.wikipedia.org/wiki/Agricultural_fencing

   Log fences or split-rail fences were simple fences constructed in newly cleared areas by stacking log rails. Earth could also be used as a fence; an example was what is now called the sunken fence, or "ha-ha," a type of wall built by digging a ditch with one steep side (which animals cannot scale) and one sloped side (where the animals roam).

6. 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 ]

7. AOL.com - News, Sports, Weather, Entertainment, Local & Lifestyle

   www.aol.com

   AOL latest headlines, entertainment, sports, articles for business, health and world news.