Abstract: An information bearing assembly comprises at least two cards each bearing informational indicia on both their front and rear faces. The cards are pivoted together via a pivot connection between the center of the lower edge of the first card and the center of the upper edge of the second card, so that they can be swiveled between a storage position in which they overlap in face to face engagement, and an open position in which the second card is swiveled down relative to the first card until the opposite side edges are aligned and the information carried on the cards forms a continuous vertical column or sequence on both faces of the resultant assembly.

Abstract: A perpetual calendar displaying selected faces or sides of a minimal number of parallelepiped blocks for displaying the year, the days of the month, initial numbering of the weeks of the year and the months of the year spelled out in a choice of several languages.

Abstract: A vacuum fuse (10) including a pair of arcing electrodes in the form of parallel, confronting, spaced apart disks (13, 14) supported on the inner ends of aligned contact rods (11, 12). The confronting surfaces of the electrodes define an arc gap (18) and are provided with a plurality of arcuate slots (54). A fusible element (19) projects from bores (23, 24) which are recessed relative to the confronting disk surfaces to bridge the arc gap and it and the arcing electrodes (13, 14) are electrically connected to the contact rods (11, 12). The fusible element (19) is flattened at the mid-point of the arc gap and a hole (22) is drilled in the flattened section. The outer housing (1) of the fuse (10) includes a metallic housing member (7) and ceramic end plates (4, 6). Use of a metallic housing (7) eliminates the need for a separate, axial, metallic shield to prevent deposition of vaporized metallic particles during current interruption.