According to an aspect of the invention, an image forming apparatus includes an apparatus body, a sound absorbing device utilizing a Helmholtz resonator, and a hinged exterior cover operable to open and close relative to the apparatus body. The orthopedic support pillow comprises two side surfaces, the two side surfaces opposing each other, and a bracing surface. This complex of propofol with 2-hydroxypropyl-\u03b2-cyclodextrin produces a clear aqueous composition that is stable to autoclaving. Two groups of resilient contact terminals are mounted in the coupling device axially symmetrically arranged with each other in the longitudinal direction, each of which has a flat section and an upwardly protruding contact section. The bolt, when in the second rotative position, is movable, in response to an application of an impact force on the steering column to collapse the steering column, into bearing engagement with the tooth lock to positively retain the tooth lock in the locking position. The snapshot server program permits one or more client programs to request snapshots of data from the snapshot server program such that the data included in or referenced by a snapshot originates from one or more host server programs and the data is accessible to the snapshot server program, but is managed independently of the snapshot server program.