Historical clue formulations

• Safecrackers — 2014-09-29
• Safecrackers — 2013-02-13
• Safecrackers — 2011-07-20
• Stethoscope users, at times — 2009-04-22
• Safecrackers — 2004-12-06
• People with safe jobs? — 2001-06-03
• Safecrackers — 1996-04-27
• Bank burglars — 1994-06-15