A data transfer circuit has a control circuit which outputs a clock control signal and a data control signal and receives a selectively controlled write signal and a fixed voltage level corresponding to a mode instruction signal-. A force-application unit builds up a clamping force, when the first platen assumes a closing position. The communications server is also arranged to receive inputted user data from the remote user terminal, relating to the current event. A map describing a relationship between the plurality of luminance pixels of the luminance frame and the plurality of transformed luminance pixels of the transformed luminance frame is created. One of the forceps elements has a distal end pivotal about a pivot axis which extends orthogonally to a longitudinal axis of the shaft, so that the distal ends of the forceps elements can be displaceable at a distance greater than on outer dimension of the shaft upon its insertion into a corporeal cavity.