Abstract: A retaining system, in particular for retaining bundles of wires in a telephone exchange, comprises successive stages (E1, E2) each constituted by a hook (B2, S2, 18, 20) which, together with the hook (22) of an adjacent stage (E1) constitutes a loop suitable, for example, for retaining a bundle of electric wires. The first stage (E1) is provided with fixing means (W) for fixing it to a supporting structure. Each subsequent stage (E2) is connected to the preceding stage (E1) by a link rod (T1) which is snap-fastened in housings (L1, L2) in each stage. The invention is applicable to telephone exchanges.

Abstract: A microprocessor system including a microprocessor as the central processor unit and having memory read and memory write control outputs and peripheral device read and peripheral device write control outputs. The system also includes a peripheral device and a memory connected to the microprocessor via data-, address- and control buses and provided with read and write control inputs. The system employs combinational logic circuits for controlling the interconnections of the various system devices with the microprocessor in a predetermined way.