A mullion sealing bridge and method for use in a curtain wall system. The distinguishment information stored in the memory of the expendable installed in the mounting portion is read out, and operation of a predetermined object is controlled on the basis of a control information according to the distinguishment information when the distinguishment information read out represents that the expendable is compatible. When the CMOS amplifier is applied to a biquad LPF, a high voltage linearity over about 200 mV peak-to-peak and an suitable ultra wideband property over about 320 MHz of an cutoff frequency may be achieved. The signal generator may generate a test signal to the data bus port at a first voltage level with a duty cycle of fifty percent or greater. Upon the activation of a switch, the first indicating element of at least one playing position in the associated geometric pattern changes its indicating state, and the second indicating element of at least one different playing position in said associated geometric pattern changes its indicating state. of less than 25%, and evaporating this diluted mixture into a volatile product stream and an AlCl3-containing solid.