In one embodiment, a bracket for mounting a rod to a surface has a surface-mounting portion and a rod-attachment portion. The memory controller includes a first port and a second port which receive and transmit N-bit data values, respectively; a third port receiving and transmitting 2N-bit data values; and a fourth port and a fifth port receiving and transmitting the N-bit data values, respectively. A set of three disc brushes is located behind the cylindrical brush, followed by a suction liquid recovery device for suctioning spent solution.