A foldable bench having at least a pair of seat sections pivotally connected together. Thus, the output shaft, the gear mechanism and the switch unit are accommodated in a housing, and a groove section for weakening the stiffness of the housing is formed in housing at a position which avoids a position where the switch unit is arranged. The composite panels are affixed to a respective hat-shaped inner side post between adjacent vertical ends of the composite panels. Methods and techniques are provided for confirming that a given composition contains substances sequestered from a particular source e. The amplifiers at the end of each row and column also provide conversion of the signals from a current to a voltage. The apparatus also includes a position disturbance correction system for correcting a position of the first substrate holder with respect to the patterned projection beam due to the influence of gas pressure differences or gas movements, caused by movements of the movable part.