A processing method and an associated device for accessing a spatio-temporal part of a compressed video sequence. An exemplary embodiment of the system includes a main housing defining an open housing space and an opening. When the sealing plate is laser welded to the rim of the external casing, the presence of the drop means that there is no direct thermal conduction path from the welded parts to the center of the sealing plate, which reduces the dissipation of heat away from the welded parts. The partial coherence value can be changed to print different types of semiconductor features. The plunger is restricted against free sliding movement by a friction head which presses against the side of the plunger.