Abstract: A frame for holding circuit boards, which comprises a metal back plate, pairs of opposed, channel-section guides, disposed at right angles to and extending forwardly from the back plate, for receiving the edges of circuit boards, connectors mounted on the front of the back plate for establishing electrical contact with circuits on the boards fitted into the guides, each connector including a plastics moulding, having a plane rear face and a recess on its front surface for co-operation with a board and carrying metal contact pins which project from its rear face through holes in the back plate, and an insulator disposed between the rear face of each connector and the back plate, the insulator consisting of at least one strip of plastics material having at least one row of holes to receive pins on the connector and tubular extensions which surround the portions of the pins which extend through the holes in the back plate.

Abstract: A wiring pen including an elongate pen-shaped body. A bore extends through the body from one end of the body to a tip at the other end of the body for the passage of a wire to the tip. A slot is formed in the body so that the bore leads to one end of the slot and continues from an opposite end of the slot to the tip. A slider is slidable in and along the slot. A tongue is formed on the slider and, in a separated position of the tongue and the slider in which the tongue is spaced from the slider, providing a path between the tongue and the slider for wire to pass to the tip. The slider and the tongue are relatively movable from the spaced position towards one another to close the path and grip the wire therebetween. The slider, in its closed position, is slidable in the slot to move the gripped wire towards the tip.