A fabrication process of a mask ROM is disclosed, which process is effective to suppress the occurrence of punch-through of a memory cell transistor. The wireless interface device includes a wireless interface unit, a processing unit, an inputoutput unit, and may include a power management unit. The method includes perfusing the organ at hypothermic andor normothermic temperatures. A permanent virtual channel is provided between the base station and the controlling PLM element for PLM-specific signalling. There is no need for soldering a separate glass bead into the housing 2, which at these high frequencies, is very difficult due to the small size of the glass bead.