Two pairs of brass knuckles and a gun holster purportedly belonging to Jack Ruby are a few of the artefacts presented by Dallas County District Attorney Craig Watkins at a news conference in the Frank Crowley Courts Building in Dallas, Texas, February 18, 2008. The items are part of a batch of old documents and artefacts linked to the slaying of President John F. Kennedy recently unearthed from an old safe in a Dallas courthouse by the Dallas County district attorney's office. REUTERS/Mike Stone (UNITED STATES)