Abstract: A relay includes a base member; a magnetic system mounted on the base member and including an armature, a contact arrangement with a contact spring formed with a contact piece, and an actuating element coupled to the armature for transmitting armature movement to the contact spring. The armature element is linked to the contact spring at attack points between which the contact spring has zones of different configuration whereby the magnetic system is loaded substantially evenly upon actuation of the contact spring.

Abstract: A bow musical instrument in which at least the front (1) is constituted by a thin wall of composite material comprising at least two superposed sheets (A, B, C, D, . . . ) of crossed and directed long fibers, the wall being covered on at least one of its faces with a lining material (Y, Z) of considerably lower density than the fibers, wherein the deposition of the sheets of fibers is such that the ratio of the longitudinal modulus of elasticity divided by the transverse modulus of elasticity of the wall is higher in a wall zone close to the longitudinal axis of symmetry of the instrument than it is for a zone close to the sides of the instrument.

Abstract: An electronic access control system is provided including a two dual button self contained sequential code device that can be accommodated in a standard wall box and used in conjunction with a standard toggle switch type wall plate. The device is particularly useful as a disarming mechanism for security systems because of its inconspicuousness. The device comprises an electronic voltage regulator, input circuit network, timing circuit, coding circuit, logic network and output circuit. A condition indicating circuit and tamper circuit are also provided. The logic network preferably comprises an integrated circuit with 9 code inputs and a debouncing circuit arrangement is incorporated in the input network circuit.