Abstract: An arrangement for holding together a package of boards to be used in the manufacture of printed circuits by applying glue to an edge of the package or by applying glue into holes formed in the boards.

Abstract: A security system for a metal cabinet door comprises a latch adapted to be locked by a lock operating the latching members of the door. These comprise upper and lower strip members each having a plurality of hooks each of which, when the door is closed and latched, is engaged in an opening formed in a locking profiled member attached to the cabinet and at least one rotating sector whose rotation axis is perpendicular to the plane of the door. When the door is closed and latched the sector(s) enter an opening in a longitudinal member attached to the cabinet on the same side as the hinge(s). The sector is operated in the unlatching direction by the latch through a cable and in the latching direction by a return spring.

Abstract: The invention relates to an I.sup.2 L circuit in which the transistors provided with current injectors are distributed between a number of groups which are connected in series as stages between the supply connections. For the logic signal connections between a higher and a lower stage, a current source is used which is controlled from the higher stage and which is connected to the base of a controlled transistor in the lower stage. According to the invention, the switching time of the controlled transistor is reduced by providing a conductive connection which comprises the collector-emitter path of an auxiliary transistor between the base of the controlled transistor and a suitable point of a reference potential.

Abstract: A threshold-effect integrated logic circuit of the I.sup.2 L type with hysteresis including a trigger circuit and an amplifier. The difference between the two voltage thresholds of the trigger circuit is controlled by an interrupting unit, and is equal to the voltage drop across a diode. The difference between each threshold and the output level results in an immunity to long-term spurious signals and static noise.

Abstract: A device for supplying a regulated current to an integrated circuit with current injectors. This device comprises two current paths, the currents which flow in the current paths having a fixed ratio which is maintained by means of a current dividing circuit and upon which current a current dependent ratio is imposed by means of a coupling circuit, in order to stabilize two currents. In accordance with the invention at least one of the semiconductor junctions included in the device, which also stabilize the currents, is constituted by the circuit to be powered, which is based on the recognition that the circuit to be powered exhibits a voltage-current characteristic which corresponds to that of a forward-biased semiconductor junction.

Abstract: In an integrated semiconductor Hall-effect switching device, the Hall element is effectively prebiased by unequal base-emitter junction internal voltage drops resulting from unequal base-emitter areas in the transistors connected to the Hall element.

Abstract: Integrated injection logic circuits are described comprising groups of active transistors having biasing current injectors with the groups arranged in series across a voltage supply and with a signal connection between different groups. This circuit arragement allows efficient use of a higher voltage supply as might be required for other logic circuitry present.