A refrigerator includes: a cabinet forming a storage space; a door for opening and closing the storage space and provided with a receiving space; a see-through portion extending through the door and communicating with the receiving space; a door light for illuminating a rear space of the door; a transparent panel assembly for shielding the see-through portion and becoming transparent or opaque so as to selectively visualize the see-through portion according to On/Off states of the door light; and a heat insulating member, formed along a perimeter of the transparent panel assembly, for insulating a perimeter portion of the transparent panel assembly.

A refrigerator includes: a cabinet forming a storage space; a door for opening and closing the storage space and provided with a receiving space; a see-through portion extending through the door and communicating with the receiving space; a door light for illuminating a rear space of the door; a transparent panel assembly for shielding the see-through portion and becoming transparent or opaque so as to selectively visualize the see-through portion according to On/Off states of the door light; and a heat insulating member, formed along a perimeter of the transparent panel assembly, for insulating a perimeter portion of the transparent panel assembly.

An innovative ballistic door is disclosed that is destined for use in schools, offices and building structures. The innovative door comprises a hybrid ballistic core, comprising at least two sections, wherein one section is a heavy impact resistant material rated to NIJ level III strength to resist rounds fired from high-powered rifles, as well as resisting breaches from explosive devices such as pipe bombs and the like. AR500 steel plate having a thickness of inch meets this requirement. The remaining sections of the innovative ballistic hybrid core comprise at least one lighter-weight ballistic sheet material, such as E Glass fiber composite sheet, which at least comply with the NIJ level IIIA standard. This E Glass material is ideally suited to resist the impact of a pipe bomb explosion. The novel ballistic core construction allows a compromise between protective and practical weight requirements. In addition, the innovative ballistic door provides for substantial anti-breach protection of the latch and lock mechanism and hinges.

A door viewer cover includes a base with a hole through the thickness of the base. The hole is sized to mate with a door viewer to allow a user to look through the hole and thus the door viewer. The hole is offset from a center of the base. A cover is stacked on the base so that the thickness of the cover and the thickness of the base are in series while the base and the cover have an overall parallel relationship. The cover is sized to completely block the hole to prevent looking through the hole. A connection between the base and the cover allows the base and the cover to pivot with respect to one another while maintaining the parallel relationship between the cover and the base.

A door viewer cover includes a base with a hole through the thickness of the base. The hole is sized to mate with a door viewer to allow a user to look through the hole and thus the door viewer. The hole is offset from a center of the base. A cover is stacked on the base so that the thickness of the cover and the thickness of the base are in series while the base and the cover have an overall parallel relationship. The cover is sized to completely block the hole to prevent looking through the hole. A connection between the base and the cover allows the base and the cover to pivot with respect to one another while maintaining the parallel relationship between the cover and the base.

A hunting blind system includes a structure that may house a hunter. The housing has a first opening extending into an interior of the structure. A weapon is selectively extended through the first opening for hunting. A shield unit is positioned within the structure such that the shield unit covers the first opening. The shield unit is comprised of a polarized material to pass light therethrough in a single direction. In this way the window inhibits prey from seeing through the shield unit.

A hunting blind system includes a structure that may house a hunter. The housing has a first opening extending into an interior of the structure. A weapon is selectively extended through the first opening for hunting. A shield unit is positioned within the structure such that the shield unit covers the first opening. The shield unit is comprised of a polarized material to pass light therethrough in a single direction. In this way the window inhibits prey from seeing through the shield unit.

Assemblies, sensors, methods of attachment, communication networks, and operational processes of a door-mounted camera apparatus for use with a door's peephole viewer. Some embodiments include a door bracket for attaching the camera apparatus to the door using removable adhesive or embedded magnets. Embodiments may include a movable mirror assembly which may be operated by a hand or by electrically powered mechanical actuator. Some embodiments include a peephole viewer apparatus with integrated sensors. Embodiments can include a digital display for viewing the camera's video output. Some embodiments can include a wired or wireless external sensor module which may detect whether a person is present in front of the door. Another embodiment includes a key-holder magnet.

Assemblies, sensors, methods of attachment, communication networks, and operational processes of a door-mounted camera apparatus for use with a door's peephole viewer. Some embodiments include a door bracket for attaching the camera apparatus to the door using removable adhesive or embedded magnets. Embodiments may include a movable mirror assembly which may be operated by a hand or by electrically powered mechanical actuator. Some embodiments include a peephole viewer apparatus with integrated sensors. Embodiments can include a digital display for viewing the camera's video output. Some embodiments can include a wired or wireless external sensor module which may detect whether a person is present in front of the door. Another embodiment includes a key-holder magnet.

An installation for improving the binocular visual field includes a structural element located at a distance from the observer equal to or greater than the observer's interpupillary distance. The structural element is provided with at least one through aperture, in which an optical system is applied that has two convergent lenses, between which a divergent lens is centrally interposed, the distance between each of the convergent lenses and the central divergent lens being such as to make the optical system of a neutral afocal type.