Historical clue formulations

• Classic Mercedes roadsters — 2015-12-10
• Mercedes roadsters — 2014-06-19
• Mercedes models — 2013-01-13
• Classic Mercedes roadsters — 2010-02-11
• Classic Mercedes-Benz roadsters — 2007-07-04
• Some Mercedes-Benzes — 2005-08-28
• Mercedes models — 1994-02-19