| http://www.w3.org/ns/prov#value | - Preferably, the tip of the lancet device has a rectangular shape and corners of the tip are brought into contact with and are pressed against the portion except for the groove of the inner circumferential face of the concave portion, thus attaching the attachment part to the tip of the lancet device in a pressure contact state, and the corners are moved to be positioned in the groove, thus releasi
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