Historical clue formulations

• Bus. card info — 2017-01-22
• It may have an ext. — 2012-07-27
• Cell assignment: Abbr. — 2011-10-21
• Cell assignment: Abbr. — 2006-10-27
• Info on a bus. card — 2005-05-08
• Bus. card info — 2004-08-29
• Singles bar giveaway?: Abbr. — 2003-11-02