A carrier attachment for a handtruck is comprised of a simple, foldable, detachable panel system to laterally support and tightly secure carried articles. A back plate and two side plates, interconnected by hinges, may be secured against a carried load by straps that extend across the front of the two side plates. The hinges are restricted to 90-degrees of movement. The back plate includes hang brackets on its rear side which are fitted over horizontal cross braces of the truck frame to attach the carrier. The carrier may be easily collapsed into a folded position so that the unit is very compact and easily stored.

A method and system for the efficient distribution of electronic mail items within a distributed data processing system having multiple users enrolled therein wherein each user utilizes a computer or terminal device having a unique address. After selecting an individual electronic mail item for distribution an intuitive graphic representation of a group of unique addresses is displayed within a user's terminal device. The intuitive graphic representation may take one of several forms including a two or three dimensional graphic representation of an office floor plan which identifies the occupants of each office, or a photographic image of one or more users. In response to a graphic selection by the user of a particular graphic representation, or portion thereof, an identified electronic mail item is then automatically distributed to the user whose unique address is associated with that graphic representation or portion thereof. In one embodiment an electronic mail item is displayed as a miniature graphic representation or "icon" and is thereafter automatically distributed in response to a relocation of that icon to a position overlying the graphic representation or portion thereof, utilizing well known "drag and drop" techniques.

A transportable display stand includes a collapsible and erectable stand structure including a front wall, a rear wall, two side walls, and a bottom wall, and a roller assembly built into the stand structure. The walls constituting the stand structure are hingedly connected to one another for movement between their collapsed and erected positions in which they lie substantially flat against one another and extend substantially normal to each other, respectively. The roller assembly includes at least one roller mounted on a lower portion of the stand as considered in an erected condition of use of the stand on a horizontal support surface for displaying a plurality of items on display and at the rear wall for rotation about an axis parallel to the rear wall. The roller is disposed on the stand so as to be spaced from the support surface in the condition of use of the stand and in engagement with the support surface in a rearwardly tilted position of the stand.

A pre-assembled wheeled assembly is attached as a pre-assembled unit to a foldable, erectable display stand, and is removable as a pre-assembled unit from the stand. The wheeled assembly includes a support, at least one wheel journaled on the support, and holders on the support for quick and easy attachment and removal of the wheeled assembly.

Semiconductor light emitting circuits include semiconductor light emitting diodes that are serially connected between a pair of input terminals. Four layer semiconductor devices, such as Shockley diodes and/or thyristors are also provided, a respective one of which is connected across a respective one of the semiconductor light emitting diodes. The four layer semiconductor devices can allow a string of light emitting diodes to continue to be lit if one light emitting diode fails.