An electron emission device includes a cathode substrate and an anode substrate facing each other that are separated from each other by a predetermined distance to form a vacuum vessel. A seat is rotatably mounted on the base and is releasably set any desired horizontal direction by an adjustment knob. Because of the rules governing Abstracts, this Abstract should not be used to construe the claims. The conveyor belt includes article-supporting rollers on a top side. Said composition is useful for slush moulding, for thermoforming sheets or injection on an insert.