A multi-purpose mat has open and folded configurations. A space between the flange and the bearing defining a dampening chamber such that on movement of plunger toward an actuation chamber, fluid is drawing through a controlled flow path into the dampening chamber. The cathode ray tube according to the present invention effectively suppresses the howling of the shadow mask and removes the problem suffered conventionally in case of the grill type shadow mask that the grills deviated due to the increased pressing or friction force with the shadow mask are not returned to their original form, . The template may be used to search an existing token store to find assertions that have been made, andor to generate assertions that have not been found in the token store and that would satisfy the template.