Abstract: A fencing for preventing insects to enter an open air area comprising a substantially upright structure with a height suitable to prevent low flying insects to enter said open air area. The structure of the fencing is impregnated with an insecticide.

Abstract: A barrier system utilizing cutters that have been connected into strips, with the strips connected to form a substantially planar barrier sheet. The barrier sheet may be encased by breakable separators, which cover the cutters to prevent inadvertent injury but expose the cutters when broken upon an attempt to penetrate the barrier. The barrier may be retracted into an opening, preferably into a concealed compartment.

Abstract: An improved animal barrier material and an improved fastening system to simplify its knotting process are disclosed. In the preferred embodiment, a plurality of multi-stranded metallic cables are joined together using parallel overhand knots. A pair of metallic cables may be taken together to form substantially adjacent portions which then form a loop. The pair of metallic cables passes around a portion of the loop and through the loop to form a overhand know. Such a knot minimizes stress and fatigue on the netting and makes the netting nearly invisible to the naked eye at a distance of more than a few feet.

Abstract: An improved animal barrier material and an improved fastening system to simplify its knotting process are disclosed. The animal barrier material comprises a see-through cable netting characterized by strong and secure knots. An improved fastening system may be employed to simplify knotting and produce superior cable connections. The improved fastening system requires only a single spool of cable to form grids for netting; its simplified knotting process does not require passing a spool of cable through any previously-tied portion of the net. The resulting cable netting provides a superior see-through netting for simultaneous containment and visual enjoyment of zoo animals.

Abstract: Fence fabric formed of a multiplicity of entwining electrically conductive metal wire cores each coated with a heat disintegrable electrical insulation is rendered susceptible to grounding by disposing each of said metal cores in contact with at least one electrically conductive ground element. To produce this product, one or more of the foregoing conductive elements is placed in permanent contact with each coated wire of the fence fabric and sufficient current passed through said conductive element to disintegrate the insulation coating and provide an electrically conductive path between the metal core of each of said wires and said electrical conductor.