A diagnostic imaging system includes an x-ray source, which is rotated around an examination region on a rotating gantry. One particularly useful application of the present invention is in a cooling system for a turreted gimbaled system that includes electronic and optical equipment typically used for surveillance, but many other applications will become apparent to those skilled in the art after being taught by the present disclosure. The electric connector is detachably connected to the mounting board. The system includes an abutment receiving portion adjacent the top end for receiving an abutment. Indexing of the eccentric nose is provided by a slight retraction of the tubing string in the well hole. A memory cell M00 comprises a pair of inverters cross-coupled with each other, a first switching unit provided between bit line BL and the output terminal of one of the inverters, and a second switching unit provided between bit line XBL and the output terminal of the other inverter.