Abstract: The invention provides one or more question cards and one or more answer cards, where each answer card corresponds to one or more question cards, and whereby a student is can associate each question card with an answer card, and learn by confirming the matching of pattern s located on each card to determine if a correct answer has been chosen. The question card may display an illustration sketch or diagram, or express a statement, an incomplete statement, a question or a mathematical expression, or any of these images separately or in combination. The answer card may express the truth or falsehood of a statement of a corresponding question card, a word or sentence fragment which can be used in combination with an incomplete statement of a corresponding question card to complete a statement, a statement that comprises a correct answer to a question of a corresponding question card and/or a mathematical expression or value that comprises a correct answer to a mathematical expression of a question card.

Abstract: A multi-position door security system that provides a primary locked position keeping a closed door secure and also providing varying degrees of secure openings to allow a user to see outside or accept envelopes and packages through an opening. The invention is formed of a cable and a locking bracket which is attached to the frame of the house. The cable is looped and secured around a door knob and is then passed through one or two keyway openings in the locking bracket. One or more locking fitting are rigidly attached to the cable. The locking fittings are sized such that they do not fit through the openings of the locking bracket. This allows the user to choose how far the door will open by choosing which of the locking fittings engage the locking bracket. The invention also allows for easy disengagement by the user in case of fire or emergency. Because of the design and materials used in construction, the invention is secure, economical and easy to install.

Abstract: A device that mounts on the top of each fence post along a security fence and utilizes an alarming arm which produces an electric alarm signal when moved or displaced. When a multiplicity of the units are mounted on the tops of all of the fence posts along a security fence with the alarming arms pointed outward from the fence line and barrier material is strung between the alarming arms, an extended barrier is created which increases the height of the security fence and produces an alarm when an intruder attempts to climb over the extended barrier and moves the alarming arm(s) or any member of the extended barrier supported by the alarming arm(s), thus moving the alarming arms. An extended barrier may also be installed along the top of walls by installing a plurality of devices spaced at distances approximating the spacing of fence posts along a line of security fence with barrier materials strung between the alarming arm(s).

Abstract: An intrusion detection device that can be used singly or in multiplicity to immediately and silently alert the user of attempts to climb over a security fencing system. The invention consists of a base element which attaches to the security fencing, and an alarming arm. The alarming arm is equipped with barrier material, such as concertina wire or barbed wire. The alarming arm is connected to the base element both at a pivot point and through a tensioning means. Attempts to climb over the barrier material result in additional loading of the alarming arm which rotates transversely about the pivot point, and against the force of the tensioning means. This rotational displacement of the alarming arm enables an electrical sensing device which then signals that an intrusion is in progress.