Abstract: A self-supporting modular switchboard panel formed from a plurality of rectangular frame elements with four solid side faces. The corner edges are beveled to provide a 45.degree. angle with the side faces so that when four frame elements are placed together to form a rectangular section, the center thereof forms a square which serves as a perch for retention clips and cover fasteners. Projections and grooves are disposed on opposed side faces for various retention possibilities.

Abstract: An arrangement for synchronizing a mechanical oscillating system to the accuracy of a quartz standard, in particular the timing of a clock. Timing pulses are derived from a quartz oscillation, and these act on the frequency of the oscillating system. An "existing value" signal is derived from the oscillating system, and frequency deviations of the existing value signal from the timing pulses are detected by a phase comparison. The frequency of the mechanical oscillating system is processed in accordance with the deviations that are detected.

Abstract: A technique of synchronizing an oscillating system driven by a mechanical energy storage means, particularly a timepiece having a regulating member which is set and maintained in oscillation by a pulse-like driving moment and which is synchronized by electromechanical action by means of timing pulses derived by division from a quartz oscillation, characterised in that the synchronizing action is achieved through an electromagnetic coupling or electromotively through indirect synchronization, in which a phase and frequency comparison is made between said timing pulses and an alternating voltage signal derived from the movement of the oscillating system, for example of the balance, with the oscillating system of corresponding frequency and phase, while in addition a regulating signal is derived from the comparison and is utilized to produce a torque M.sub.R which through the electromagnetic coupling applies a regulating action to the oscillating system.

Abstract: A large-sized clockwork comprising movement, a striking train, an electrical drive mechanism for the striking train, and a control section for the striking train which includes a first control element for actuation of the striking train and a second control element for limiting the striking period thereof. The two control elements include control portions which are each adapted to be sensed by a substantially reaction-free electrical sensing device, which is superordinated to the striking train drive device. Depending upon the choice of the sensing means, the control section has only negligibly small power requirements. Consequently, no restrictions which would be dictated by the control section, now exist in the selection of the movement system.