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Old watch-like navigation gadget from 1920
http://www.crunchgear.com/2008/08/18/old-watch-like-navigation-gadget-from-1920/
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Plus Fours Routefinder
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Plus Fours Routefinder
consisted of a collection of small scrolling maps that you’d “load” into the watch-like device before your trip
you’d scroll the map forward to reveal your next turn, mileage, and where to stop.
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