A reversible transmission mechanism includes an input member rotatable about a fixed shaft and having a bevel gear, a first shaft member rotatable about the fixed shaft and having a shaft portion extending perpendicular to the fixed shaft, and a second shaft member rotatable about the fixed shaft and rotationally fixed to the first shaft member. Each logical version of the filesystem, including the primary version, is assigned a unique epoch number or other identifying value, and each filesystem object is assigned two epoch numbers that define the space of logical versions for which the object exists. The completion condition is specified as part of the overall workflow. The dry type patch according to the present invention is convenient in use, as compared to wet type patches. The data line driving circuitry feeds a dummy signal to the scan line driving circuitry through the dummy data line. The RFID registration system can be avoid making the mistaken association between the RFID and the object to which the identification ID is attached.