A microphone preamplifier, comprising a differential input stage with a first and a second input terminal and an output stage with an output terminal; where the microphone preamplifier is integrated on a semiconductor substrate. The vent comprises a hole formed in the fabric of the air-bag and a flexible vent tube which extends inwardly of the air-bag from the hole so as to terminate in an open free-end located within the air-bag. Each storage unit includes a pair of plate-like molded bodies and a flat heat exchanger. The segments generated at the completion of the text analysis can then be further processed, for example, by a computer to derive statistical information, to generate a report, or to build a knowledge database. stationary, in the plane of a support surface supporting the objects and for each cutting process, the second cutting edge is moved past the first cutting edge in such a manner that at least the cutting point on the second cutting edge has a speed component in conveying direction which has the same size as the conveying direction and a speed component perpendicular to the support surface.