Abstract: In the case of a displacement or position transducer, it is provided that a onductor foil (5) is arranged over the resistor track (4), held at a distance from it and able to be pressed with flexible resilience against the resistor track, and that the slide (8) is displaceably arranged above the conductor foil (5), pressing the latter against the resistor track (4), the conductor foil preferably being electrically connected to a conductor track (2) running parallel to the resistor track (4), at a distance from it and electrically separated from it.

Abstract: A plurality of optical transmission tracts direct radiant energy from an appropriate light source to each of a plurality of photo-transistors or other light sensitive elements. The photo-transistors are adapted to generate an output signal whenever the radiant energy impinging thereon exceeds a threshold value which distinguishes environmental radiation from the radiant energy generated by the light source. A plurality of code bars, each representative of a different character code, are provided. Each code bar includes a hinged rail pivotally coupled to the housing and a plurality of radiant energy interrupting code projections depending therefrom. The number and location of the plurality of radiant energy interrupting code projections depending from each hinged rail is determined by the character code associated with the code bar of which they form a part.