A folding knife includes an elongated blade, an elongated handle, a disc-shaped cam, and a cam mechanism. The heat packs are formed of ceramic materials, high density liquids, PCM’s or the like which are capable of being rapidly heated during the brewing process but then gradually release their heat to the beverage in the urn. When there are two or more boot PROMs, each PROM stores a portion of the FPGA’s configuration data and the FPGA interleaves the data from multiple boot PROMs to generate a serial configuration data bitstream. The test voltages define a band around the reference voltage. The invention further relates to a process for preparing the above-mentioned compounds, and to their use.