Abstract: A system and method are disclosed for enabling the selective monitoring of various regions of an aperture having a powered closure operative therein. Each of plural, individually selectable emitters is adapted to provide a narrow beam whose angle with respect to a horizontal plane is offset from the other emitters. All of the radiated beams lie in substantially the same plane in azimuth. A controller responds to certain stimuli to selectively activate one or more of the emitters. The energy thus produced is monitored by a receiver preferably disposed within the same housing. The receiver output is analyzed by the controller to identify the presence of an obstacle in that portion of the aperture illuminated by the selected emitter(s). A variety of systems may provide input to the controller for the purpose of influencing which of the plural emitters are to be activated for object detection.

Abstract: An injection molded dental crown formed of an acetal homopolymer resin. A method for mass producing dental crowns is also disclosed.

Abstract: A photographic processing chemical supplier for supplying photographic processing chemicals, in particular dry chemicals in powder form to a developer solution preparing means, comprising: a container having a receiving opening through which said photographic processing chemicals are receivable in said container and a supply opening through which the received photographic processing chemicals are supplyable out of said container to said developer solution preparing means; wherein an attaching means constituted such that a cartridge is removably attachable to the supplier by means of said attaching means; and opening/closing means for opening and closing said receiving opening constituted such that said receiving opening is closed if said cartridge is removed and such that said receiving opening is openable or open if said cartridge is attached.

Abstract: An ocular prosthetic device is provided which includes a simulated pupil that does not interfere with the intended appearance of the iris image, and further which adapts to a range of ambient lighting environments to simulate the appearance of a natural eye. An iris image is provided to reproduce the color and pattern of a natural eye. A visual display, or light source, is located behind the iris image. The visual display has a series of concentric rings to produce a size range similar to the size range between that of a dilated and contracted pupil. The iris image has a pattern of light transmissive openings to permit light from the rearwardly disposed visual display to pass through the openings. The concentric rings, when activated, are visible through the openings in the iris image, and present the appearance of a pupil of a size dependent on the number of activated rings.