An extensible configuration system to allow a website to authenticate users based on an authorization protocol is disclosed. The conveyor is configured for conveying the substrate to a wet process work station. The feedback gain of the feedback amount according to the axial displacement of the power roller due to the L-shaped link, is varied according to the gyration angle of the power roller. A solid body formed of a superalloy composition is placed in the root region of the cavity so as to occupy a first portion but not a second portion of the root region. Pieces of timing film, in accordance with further embodiments of the invention, have adhesion layers for attaching the pieces of timing film to perishable articles or packages containing perishable articles and are preferably configured to be dispensed from a roll or stack of the timing film. Also, an electrophoretic display device includes a display device comprising a pair of substrates in which a light-transmitting electrode is formed on at least one substrate and the medium for electrophoretic display described above between the substrates.