Abstract: A motor vehicle starter includes an electromagnetic contactor, which is equipped with an external electrical terminal adaptor. The terminal adaptor has a body of insulating material. At least one conductive connecting strip is contained within the insulating body, with one end of the strip projecting out of the adaptor body for connection to one of the contactor terminals. The other end of the connecting strip is connected electrically to a supplementary terminal which projects out of the adaptor body so as to be in a position or orientation which is different from that of the contactor terminal to which it is connected.

Abstract: A flexible record disc engraved in the form of impressions along a track located in a ring-shaped zone is protected with a second flexible disc adhering at its central portion to the non-engraved part of the record disc. In the case where read-out is carried out on a stabilizing air cushion, the air remaining between the two discs is displaced by centrifugal force, so that good conditions of optical read-out are achieved.

Abstract: The present invention relates to the protecting against scratching and fouling of a data carrier which carries a relief impression readable optically by transmission. The data carrier in accordance with the invention is protected by a transparent protective layer with substantially smooth faces, which adheres to the peaks in the relief of the impression in such a way as to prevent the troughs in said relief from being filled up.

Abstract: The present invention relates to the protection of relief impressions formed in order to store information on a data carrier which can be optically read out by transmission. The invention relates to a data carrier the relief impression in which is protected by at least one layer transparent vis-a-vis the read-out radiation. The protective layer has an index of refraction that differs from that of the data carrier, per se. Thus, a refractive boundary at the relief impression is maintained and the information encoded in the diffractive relief pattern is preserved.

Abstract: The present invention relates to data carriers intended for optical read out. The data carrier in accordance with the invention comprises: a first transparent material at the surface of which the information is recorded in the form of an embossed pattern; a partially transparent metal layer covers said embossed pattern and a second, thick transparent material is deposited upon the metal layer for protection purposes.