Importance

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Abstract

One or a series of different size tote boxes may be extended in height by securely fastening a ring on top of it or them, which ring is preferably snapped to the top of the box by opposing hook-shaped tabs or interlocking elements. The ring is of a height to effectively change the height of the box, and if a series of different height boxes are involved, the height of the ring is such as to change a lower height box into a higher box of a size not to be found in the series. By effectively constructing the top of the ring in a manner similar to the top of the box, with respect to interlocking, rings may be stacked one upon another to increase the height of the boxes. Interior partitioning, particularly for circuit boards, is such that spacing between boards may be readily changed in a secure manner. Slotted circuit board holders have edges for insertion in opposed vertical slots, which edges are offset with respect to the plane of symmetry of such holders so that the holder may be removed, rotated 180.degree. about a vertical axis and reinserted to provide for a change in spacing less than the spacing between slots in which the board holder is inserted.

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First Claim