In an apparatus including a unit which is recoverable and reusable after use,
an environmental history indicator member having a property variable according
to an environmental history of use of the apparatus and arranged not to participate
in any functions of the apparatus during use of the apparatus is disposed inside
the unit or adjacent to the unit. By checking the state of the environmental history
indicator member when the unit is recovered from the apparatus after the end of
service of the apparatus, a management system for reuse is arranged to easily and
efficiently decide the unit to be reusable or no longer usable.