An X-ray window includes a primary and a secondary window element. The upper die includes a stop piece having a stop projection that is engageable with a stop groove that is formed in the left-right direction in each of upper die contact faces which face each other in a front-rear direction, the stop piece being movable out of and into a surface of the upper die and pushed in a direction to project out of the surface of the upper die. Also, through the use of such timers, no real time software adjustment is required. Terminals extend from the electrode plates to a top surface of the core. Each functional object may include a discrete hardware processor or may be embodied as a virtual processor within the operations of a single processor.