The magnetoresistance is measured for a magnetoresistive layered-structure, such as a spin valve film, prior to formation of an upper shield layer as well as patterning of a lower shield layer. The mechanism is a pump which is positioned and retained inside of the ball and which is operable from outside of the ball to pump ambient air into the ball. The receiving groove is wider than the protrusion and it has an arc-shaped deepest portion against which a top portion of the protrusion abuts, and the top portion of the protrusion has a curved surface formed such that the curvature of the top portion is greater than or equal to the curvature of the deepest portion of the receiving groove. They buffer the image and expand the image to generate an expanded contone layer, a black layer and a layer for infrared printing. The inner valve has an inner valve body indirectly pressed by the male connector and opened in the case where the male connector is inserted into the insertion opening. Each of the plurality of covered dimples has at least one overhang land area portion that covers a portion of a concavity of the covered dimple.