Abstract: A fixing device for a type-carrier disk in which the selection shaft includes a selection shaft, a flange defining a rotation plane and a conical end. The type-carrier disk comprises a central part cooperating with the flange and a conical seat for housing the conical end of the shaft. The central part of the disk has two apertures disposed symmetrically with respect to the conical seat for housing fixing members pivotally mounted on the flange. Resilient elements cooperate with the fixing members for holding the central part of the disk tight against the flange and the conical seat tight against the conical end of the shaft. A knob of the central part is adapted to remove the disk from the selection shaft against the action of the resilient elements.

Abstract: This invention relates to liquid crystal display devices. One aspect of the invention concerns the electrolytic growing of projections on one plate of the device so that the projections register with the tin-oxide segment array on the other plate; another aspect concerns utilizing similar projections as internally placed spacers. An insulative sheet is deposited over the segment array in order to filter D.C. components, according to a third aspect of the invention, and, according to a fourth aspect, a spacing technique is disclosed which utilizes alumina particles in a glass matrix as an edge spacer. Further, a light concentration technique, utilizing a one-way mirror and a prism or fiber optic assembly, is disclosed.