A combination cooling plate and micro-spray cooling system beneficial for use in testers of electrically stimulated integrated circuit chips is disclosed. The light-emitting device includes an organic compound layer containing a phenanthroline compound represented by the general formula I and a carbonate. Said links are characterised in that they consist of a tube comprising at its end a flat surface, for example perpendicular to the axis of the tube and perforated with an eyelet through which passes the ball-hook. Page segments are requested by the client from the application server whenever a page fault occurs from the cache for the application program. The housing may be coupled to a plurality of types of vehicles and is such that a plurality of types of tools may be coupled to the housing.