A taped bag feeder having a housing with a bag guide positioned thereon, a drive mechanism, a first reel and second reel for supplying an assembly of imbricated taped bags to a packaging operation. The machine includes a card reader for reading user cards, and at least one of a note acceptor and a cash dispenser. 05 molL n-butylamine-containing DMF solution of larger than 0. A control circuit controls the operation of the switching element so that the conducting state of the switching element is controlled exclusively as a function of the input voltage, while the nonconducting state of the switching element is controlled exclusively as a function of the output voltage. First and second slurry dispensers, each comprise an arm comprising a pivoting end and a distal end, at least one slurry dispensing nozzle on the distal end, and a dispenser drive capable of rotating the arm about the pivoting end to swing the slurry dispensing nozzle at the distal end to dispense slurry across the polishing platen. The boundary indicator indicates whether a collective result generated from the intermediate results is within a boundary precision value.