An automated multi-speed transmission includes an engine clutch operable to establish a releasable drive connection between the engine and an input shaft, an output shaft adapted to transfer power to the driveline, and a synchromesh geartrain having a plurality of constant-mesh gearsets that can be selectively engaged to establish a plurality of forward and reverse speed ratios. In an integrated base station, an external information communication section controls communication with a server. The drive portion and the driven portion contact each other by a first load which can transmit the driving force from the driving source to the opening-closing mechanism when the clutch is the energization state. The retention device includes a first configuration in which the overall dimensions of the retention device are larger than at least one dimension of the dental site. The end section or extension and its yoke are integrally formed in one single piece.