Abstract: A high density electric power supply device formed by stacked circuit modules including top, bottom and intermediate modules, each of the modules having electrical contact elements retained in engagement with complementing contact elements on an adjacent one of the stacked modules under a force having a direction to press the top and bottom modules against the intermediate modules. Each of at least the intermediate modules have supply and return ports parallel to the direction of the aforementioned force and at least some of the modules having a passageway for circulation of cooling fluid between the supply and return ports therein. An elastic seal circumscribes each of said supply and return ports on at least the intermediate modules for maintaining a continuous fluid-tight passageway through the supply and return ports among the stacked circuit modules, the elastic seals being maintained under compression by the compressing force.

Abstract: An assembly for optical communication between a pressurized high-voltage component housing and a low-voltage component housing having respective abutting side walls.

Abstract: A heat dissipating container for electrical components immersed in a liquid dielectric in one chamber and for electrical components surrounded by an air dielectric in another chamber. A flexible bladder serves as a common wall with the liquid dielectric chamber and an air filled recess that is in communication with the air filled chamber to compensate for expansion and contraction of the liquid.

Abstract: An electrical feedthrough system for pressurized containers comprising a `T` shaped flexible member adapted to pass through an opening in a container and an epoxy used as a secondary seal and support. A conductor passes through the `T` shaped member which maintains a seal around the conductor. Electrical connections are made to terminals at either end of the conductor.