The invention is directed to a memory cell on a substrate having a plurality of shallow trench isolations form therein, wherein top surfaces of the shallow trench isolations are lower than a top surface of the substrate and the shallow trench isolations together define a vertical fin structure of the substrate. A signal line driving circuit generates, on a signal line, a signal current corresponding to the image data, by switching bit weighting currents output from bit weighting current source circuits provided for respective bits of the image data, using a switch circuit turned onoff dependent on the corresponding bit. The majority of the pellets have at least one axis of at least 3 mm length and are bound such that a majority of the pellets is in contact with six adjacent pellets in the same layer to provide mutual lateral confinement therebetween. 1x enabled network supporting WPA andor an IEEE 802. At least part of the solvent and the flush gas are recycled to the system, and in still further preferred aspects, filtration of the solvent continues during the cleaning cycle via a bypass circuit through which the solvent is routed to a second filter. Apparatus is provided comprising a plurality of antennas for transmitting an interrogation signal to a sensor, the sensor being mounted to a wheel to be assessed and being adapted to detect the condition of the wheel; wherein the antennas are arranged in a line along a path to be followed by a wheel to be assessed.