The present invention relates to chemical processes for the manufacture of certain quinazoline derivatives, or pharmaceutically acceptable salts thereof. After a motor control center subunit is secured into a motor control center compartment, the supply power contacts may be advanced to engage supply power buses. A third terminal for coupling to a second signal generator is connected to the other of the cathode and anode. After having engaged the jaws on the lateral faces of the spacer-grid, the measuring tool is made to rotate about a horizontal axis perpendicular to the front face of the spacer-grid.