This invention comprises the novel compounds of formula wherein n, m, t, R1, R2, R3, R4, R5, L, Q, X, Y andhave defined meanings, having histone deacetylase inhibiting enzymatic activity; their preparation, compositions containing them and their use as a medicine. The pacing is conducted over a release period T that is longer than the period of time that would occur if all of the data units of a given plurality were released instantly. The shelves may be mounted by affixing a panel to the tire section along the plane at which the tire is cut, and then affixing the shelves to the panel, whereby removal of all or a portion of the panel from the tire section also allows removal of the shelves. Thus no element external to that session can reach or degrade the service information, and its permanence is guaranteed until the end of the session. Each non-volatile cell device may be a 2T FLOTOX-based EEPROM cell, a 2T flash cell, 1 1T flash cell or a 1.