Abstract: A device is disclosed for attaching to or removing modular electronic components from a substrate which is adjustably positioned beneath a heater means delivering a flow of uniformly heated air. The heated air is directed to the sides of the component to melt solder associated with terminals thereon by a series of changeable nozzles which can be moved into or out of registry with the component. Vacuum means is also provided for contacting the component to position it on or remove it from the substrate.

Abstract: An apparatus is disclosed for removing or installing at least one through-hole mounted component from a printed circuit board or the like, the apparatus including a compliant mask for contacting and supporting the printed circuit board with the mask having at least one hole extending therethrough and the hole being aligned with the component. A conduit is provided for directing liquid solder into the hole in the mask to contact leads of the component and thus facilitate installation or removal thereof from the board.

Abstract: A device is disclosed for attaching to or removing modular electronic components from a substrate which is adjustably positioned beneath a heater means delivering a flow of uniformly heated air. The heated air is directed to the sides of the component to melt solder associated with terminals thereon by a series of changable nozzles which can be moved into or out of registry with the component. Vacuum means is also provided for contacting the component to position it on or remove it from the substrate.

Abstract: Pressure transients are used to produce motion for high speed printing of DOTS; in a first embodiment each printing element in an array of printing elements has the form of an angled rigid tube sealed at the ends; one end is fixed, the other end is free to move; the tube is filled with suitable fluid and has two electrodes associated with it and the fluid; a spark across the electrodes on demand produces a pressure transient by expanding the fluid, in turn tending to straighten or otherwise suitably deform the angled tube in a direction advancing the free end for printing; in a second embodiment employing ink as the fluid, a ball point pen arrangement dispenses ink as the second end advances on spark actuation.