Disclosed is a method of inspecting a reticle defining a circuit layer pattern that is used within a corresponding semiconductor process to generate corresponding patterns on a semiconductor wafer. The memory device includes a matrix of memory cells having a plurality of rows and columns; the matrix includes a plurality of rows of operative memory cells each one for storing a variable value and at least one row of auxiliary memory cells each one storing a fixed value. In certain aspects of the invention, the placement enhancement structure comprises one or more protrusions located along sides of the appliance, and optionally some of the protrusions are located within a recess that extends along an occlusal or gingival side of the appliance. The charger ECU controls the charge circuit such that, when the input voltage Vin falls down to a threshold voltage V1 the current flowing through an external power supply system is reduced to suppress further reduction in the input voltage Vin. Preferably, the status of the subsystem is indicated to an operator positioned on the tractor. The mirror element with the protection film connected to the substrate is peeled from the die of the semiconductor.