Abstract: A vibrating plate serving as a tamping device comprises an upper mass (1) equipped with a drive and comprises at least two lower masses (2a, 2b), which are coupled to the upper mass (1) while being able to oscillate relative to the upper mass (1). Each of the lower masses (2a; 2b) comprises a soil contacting plate (6) and at least one oscillator (7) assigned to this soil contacting plate (6). The oscillators (7) can be controlled differently so that, in addition to an advancing and compacting action, a turning moment can be executed about a vertical axis (Z).

Abstract: A vibration plate with a top mass and a bottom mass has, in addition to a spring device, a stabilizing device with which the bottom mass can be guided during its movement relative to the top mass. The stabilizing device has a transverse stabilizer which prevents tilting between the top mass and the bottom mass. The stabilizing device may likewise be formed by one or more Panhard rods, which prevent a transverse displacement between the top mass and the bottom mass.

Abstract: The memory device has a selection device which, when required, ensures that backup memory cells or backup memory cell areas are used instead of memory cells or memory cell areas which cannot be written to or read from properly. Information about the location of the memory cells which are possibly not to be used is actually supplied to the selection device at an instant at which it is not yet definite whether memory cells need to be replaced.