Historical clue formulations

• Demolition cleanup machine — 2016-02-26
• FedEx employee, at times — 2016-01-16
• Caterpillar machine — 2015-11-08
• Stevedore, at times — 2013-04-07
• Dump truck filler — 2011-08-19
• Construction machine — 2009-05-22
• U.P.S. staffer, at times — 2007-04-29
• Stevedore — 2006-12-03
• Construction machine — 2005-10-15
• Machine at a demolition site — 2003-03-07