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I've spent a lot of time over the years collecting links to the best vintage and antique reference sites. My favorites are below (impartially - no royalties!), in hopes that some of you might find them handy!
(more to come)
General Reference:
Dating by US Patent Numbers: (Though keep in mind that the object with the number could have been made anytime after that, even decades.) http://www.biddingtons.com/content/patentchart.html
Converting measurements: http://www.onlineconversion.com/
Currency conversion: http://www.xe.com/ucc/
Language translator: http://babelfish.yahoo.com/
Converting a past price when new, to what the equivalent might be today: (Be sure to read the instructions as to which method is best for your purpose - and convert to pounds first!) http://www.measuringworth.com/ppoweruk/#
US Post Office holiday schedule - which is stupidly difficult to find: http://www.usps.com/communications/newsroom/calendar/federalholidays.htm | 
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