The disclosure relates to a joint-edge element for expansion joints in roadways wherein the anchoring parts, that extend in the longitudinal direction of the joint, just as the remaining parts of the joint-edge profiled element, are joined in one piece to the joint-edge element. At least one profiled part of the joint-edge element is produced by dividing the double profiled element in two profiled halves. Joint-edge elements having the double length of the particular extrusion casting or rolled element are produced through a single operation of extrusion or rolling. A particularly expedient embodiment is produced in such a manner that the anchoring parts are formed by parting a connecting portion of the double profiled element. The parting operation can be performed without considering the precision of manufacture, with relatively low expenditure. A secure holding and a perfect embedding in the concrete under-structure can be obtained in such a manner that the anchoring parts are produced through the parting operation effected along a line extending in the longitudinal direction of the joint and effecting a serration-type reciprocal meshing of the two halves of the connecting part. The line can here be undulated, dented or provided with another regular or irregular curvature. The serration type gaps permit one to obtain a perfect concrete work, since no cavities have to be filled.

A switching matrix adapted to interface blind persons with electronic signals of the type used to drive a visual digital display device is disclosed. The matrix includes at least one series of raised electrically conductive terminals grouped into sets of braille coded characters representative of the digits 0 through 9 mounted on, but insulated from, an electrically conductive substrate. Each set is adapted to short circuit to the surrounding substrate when touched with a fingertip, thus forming a touch controllable switch. An electronic circuit employing the matrix is also disclosed which produces an audible signal when the user touches a set of the terminals energized by a signal driving the corresponding digit of a visual digital display device.

In a combination wristwatch and calculator, a key input means for information entry employs a touch sensitive electronic switching circuitry comprising a C-MOS inverter. One electrode for the touch sensitive electronic switching circuitry is provided on the front panel of the combination wristwatch and calculator, whereas another electrode for the touch sensitive electronic switching circuitry is positioned on the rear surface of the combination wristwatch and calculator. The present key input means is equally applicable to a miniature electronic calculator.

A touch sensor array system comprises an array of sensor elements (12) each actively addressable by means of a switch device (16), for example two terminal devices such as diodes or MIMs, or TFTs, controlled by a driver circuit (22) to load a predetermined charge into a capacitor (14) of the element. Touching a sensor element dissipates this charge which is detected during a subsequent addressing stage by sensing particular charging characteristics with a monitoring circuit (24). With a row and column array, the elements (12) are addressed one row at a time at regular intervals using a row conductor (18) common to a row of elements. Each column of elements shares a column conductor (20) connected to the monitoring circuit. Various schemes are described enabling wired or isolated styli or a finger to be used as position designating means. The array is fabricated using thin film deposition techniques and high resolution arrays are easily achieved. The system can be used as a display overlay.

An electronic wristwatch having calculator circuitry operated by the time standard signals utilized to operate the timekeeping circuitry is provided. The electronic wristwatch includes a timing pulse generating circuit for producing a plurality of signals. Timekeeping circuitry is coupled to the timing pulse time standard signals produced thereby, for producing a plurality of timekeeping signals representive of actual time in response to at least one of the time standard signals being applied thereto. A digital display is provided for displaying actual time in response to at least some of the plurality of timekeeping signals being applied thereto. Calculator circuitry is provided for producing calculation signals representative of numerical information or a calculating function in response to receiving at least two of the time standard signals produced by the timing pulse generator means, the digital display being adapted to display the numerical information and calculating function in response to the calculating signals produced by the calculating circuitry being applied thereto.