| http://www.w3.org/ns/prov#value | - Preferably, the concave portion has an inner circumferential face provided with at least one groove along a depth direction, a part of the peripheral surface of the tip of the lancet device is brought into contact with and is pressed against a portion except for the groove of the inner circumferential face, thus attaching the attachment part to the tip of the lancet device in a pressure contact st
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