The invention relates to a process for preparing highly concentrated flowable and pumpable aqueous solutions of betaines by quaternization of compounds containing tertiary amine nitrogen with \u03c9-halocarboxylic acids by known processes, wherein 0. The nonvolatile semiconductor storage device further includes at least one dummy transistor formed on the semiconductor substrate, the at least one dummy transistor having a first dummy electrode, and a second dummy electrode which has a current leakage path and which is stacked on the first dummy electrode. By means of an engagement angle of the toothing sets, a favorable force introduction angle of the actuating force on the friction brake lining can be attained. The floor-wall construction is configured to column-form documents in the document stack.