Apparatus for producing molybdenum carbide from a precursor material includes a supply of process gas and a furnace defining at least a first heating zone and a second heating zone. The image projecting device includes at least scanning monitoring means for monitoring entrance of an entering object into a projecting area on which the projecting light is projected. The switching system and the ancillary telecommunications device are coupled to each other via a channelized call data network. The support plate of the anti-squeal shim has a peripheral edge including opposite outer and inner edges and opposite side edges. The systems and techniques may be used to allow circuit test data to be accurately compared with simulation data. A system for cleaning APUs comprises a spray cleaning device and a supply system for providing pressurized and temperature controlled washing fluid to the cleaning device.