The disclosure describes a method for automatically initiating ventilation, controlling ventilation, transitioning a ventilator to subject controlled ventilation, and weaning a subject from ventilation. The inspecting apparatus includes a suction mechanism that extends the cord along a longitudinal direction of the tampon by sucking air, and a cord-length inspecting mechanism that inspects a length of the cord while the suction mechanism is sucking the air. A top portion of the transistor material stack is removed in the second region, and a top portion of the workpiece is removed in the first region proximate the gate of the transistor, forming recessed regions in the workpiece in the first region. The sectional pieces can be combined with a base unit and used for teaching multiplication, division, addition and subtraction of fractions.