Abstract: A personal electronic apparatus includes a case and a flat battery located in the case and having power and ground electrodes on one side of the battery, and a plurality of interconnection electrodes extending from one side of the battery to the other. A first circuit board is located in the case on one side of the battery and has a first set of power supply contacts for contacting the power and ground electrodes on the one side of the battery, and one or more first signal contacts for contacting one or more of the interconnection electrodes. A second circuit board is located in the case on the other side of the battery and has one or more second signal contacts for contacting one or more of the interconnection electrodes.

Abstract: A magnetic brush development roller assembly for an electrographic printer, includes a cylindrical multipole magnet mounted for rotation about a cylindrical axis within a cylindrical shell. The stationary shell surrounding the multipole magnet defines an axial slot for receiving an imaging head, and has an increased thickness in the neighborhood of the slot and a reduced thickness in a neighborhood diametrically opposite the slot, whereby eddy currents generated by rotation of the magnet within the shell and hence drag on the magnet are reduced.