The present invention is a collapsible cover used to protect an open beverage container from tampering. In the method, ion implantation masks are patterned on the surface of the single crystal substrate with openings that define the localized surface regions. A programmable control unit operates the driving, locking and levelling arrangements and the tool and receives measurements from a sensor unit. At least one front caster assembly is coupled to the first and second linkages wherein upward pivotal movement of the first linkage causes the caster assembly to undergo upward vertical movement and upward pivotal movement of the second linkage causes the caster assembly to undergo lateral movement inward toward the wheelchair. Alternatively, the upgrade grant may be downloaded directly to the UPS unit, and the unit’s software andor firmware may perform the upgrade automatically. A plate portion made of an insulating material and having a plurality of fixed contact terminals attached thereto includes a first engagement portion at the position in which a plurality of fixed contact terminals are isolated from each other and the cover includes at its inner wall surface a second engagement portion that engages with the first engagement portion.