Abstract: A programmable timing device adapted to be programmed to produce a signal after expiration of one or a multiple of timing periods. Each actuation of a programming switch representing one such timing period. And a lockout circuit effective to limit the time within which the programming switch is effective to program the device.

Abstract: An automatically relegendable keyboard apparatus includes:(a) an endwise elongated belt having keyboard legends thereon,(b) a driver engaging the belt to drive the belt endwise and present a selected portion of the keyboard belt in a planar viewing zone, and(c) a transparent key panel at the front side of said belt portion presented at said viewing zone, with associated means to provide an electrical output corresponding to the location of a selected area of the panel to which the user's finger is applied, there being multiple of said selected areas of the key panel corresponding to legends on said selected portion of the belt which are viewable through the transparent key panel.