A hinge on a cover for a container, has a pivot axis and includes at least one first member fixed against rotation and at least one second member rotatable about the axis, which first and second members are arranged coaxially along the axis. The detected metal characteristic indicates whether the wafer is at a proper location. An elongated stem has two ends with one end attached to the main body element. In that case, the management-information restoring unit determines timing of occurrence of the short break, and, after selecting a pre-log or a post-log used for restoration, performs restoration of the management information reflecting these logs on a snapshot. Each of the engaging members further has a secure part and a follower part for clamping the heat dissipating component. A core sheath monofilament is also part of this invention wherein the core is a thermoplastic polymer monofilament having a sheath of the same or different thermoplastic polymer containing the above described particles.