Abstract: A casing with common padded first and second cavities holds two self-contained, battery-operated, commercial, digital-electronic pocket-calculators in a removable fashion. The "equal/repeat" keys of both calculators are brought out to calculator-embedded contacts by the manufacturer. The casing further includes a rocking rod, two micro switches, a battery and a control circuit. The control circuit develops "shorts" spaced by one second time intervals. The calculators are used as time-pre-programmed, decrementing, by seconds, time, scorekeepers as the shorting pulses are applied to the one calculator whose owner's move it is in a game of speed chess. The calculators and other parts are consumer-replaceable.

Abstract: An electronic chassis supports a plurality of modules each provided with a small pin-point light such as a light emitting diode which will be energized only so long as the module is functioning. A back panel for the chassis in turn is provided with a plurality of observation openings respectively dimensioned and directed to be in line of sight alignment with the light emitting diodes on the plurality of modules. The arrangement is such that no ambiguity exists as to an opening and its associated module. Indentifying characters either numbers or letters are provided on the modules so that they can be visually distinguished from each other and corresponding identifying numbers or characters are provided on the back panel adjacent to the opening so that each opening has an identification corresponding to the identification of only that module whose light emitting diode is in the line of sight of the opening.

Abstract: An electronic apparatus is constructed in the conventional modern (cheapest) way by utilizing one single large etch foiled circuit board with directly soldered in or pluggable (replaceable) chips incorporating micro-circuits. Each chip carries its own top side cold light emitting diode which is not energized during normal operation of the chip. Selected first and second pins of the various plurality of connecting pins for the chip may be temporarily short-circuited such as being touched with the tip of a screw driver. The chip is designed such that shorting of these first and second pins only will energize the light emitting diode only if the chip is good and there is power going to the circuit. Thus, part of each chip is a circuit analyzing (normally dormant) circuit. Determination of malfunctioning chips and replacement thereof is thus greatly simplified for the serviceman.

Abstract: The system includes basically the provision of a plastic chassis together with magnetic members for holding electronic components onto the chassis. Such components may comprise transistors, circuit board modules and the like. A preferred application of the system is in the manufacture of television receivers. For each component there is provided a magnetic ring embedded in the plastic chassis or in a heat sink in turn embedded in the plastic chassis. A cooperating collar member of magnetically responsive material mounts a transistor, circuit board module or the like. Asymmetrical plugs and sockets are provided about the outside of the collar and ring respectively so that the transistor or circuit board module can only be inserted in the chassis when in a unique orientation. The collar and magnetic ring in such orientation are precisely aligned to provide full surface contact and thereby hold the component to the chassis and yet permit easy manual removal and replacement without tools.

Abstract: Stripped wire ends are coated with a "solder friendly" resin such that when they are placed in physical contact with terminals during assembly of electrical circuitry preparatory to soldering the same to the terminals, there is no appreciable conduction. After a routine soldering operation, the resin melts and vaporizes so that a solid electrical connection results, the resin itself serving to inhibit oxidation of the soldered connection. When a routine quality control testing operation is carried out on the electrical circuitry, any overlooked soldered connections will be immediately indicated by non conduction or poor conduction of the unsoldered portions as a result of the presence of the resin. These overlooked unsoldered connections can thus be immediately corrected. In the absence of the resin, the routine quality control testing would indicate a proper connection merely because of the physical contact of the wire with the terminal even though not soldered.