Circuit elements and wirings constituting a circuit, and first electrodes electrically connected to such a circuit are provided on one main surface of a semiconductor substrate. Said locking system including a tongue and a groove for vertical locking of two joint short edges and for horizontal joining a locking groove formed in the underside of a first one of the short joint edges, and a portion projecting from the second short joint edge having a locking element cooperating with the locking groove. Based on the control value, a phase of a pulse regulating the sampling timing of AD conversion can be compensated. The preferred snow plow may also include an attachment member located on the mounting apparatus, wherein the plow blade retention member may be removably secured within the attachment member when the plow blade is in a non-working orientation. Thereby, two sets of fans are formed in a single enclosure to increase the heat dissipation effect while the assembly convenience is improved. The transmission judging part judges whether or not the regular transmission was carried out in the time zone for today.