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    Universal Planisphere
    From: Dave Walden
    Date: 2009 Apr 7, 10:57 -0700

    Google patents for these:
    
    3,858,334
    4,012,851
    4,083,121
    
    It's an interested planisphere.  Sky on one side, world map on the other, with 
    linked dials.  Can't find that they were ever actually made or sold.  Anyone?
    
    (Perhaps the excel wizards could make one up for us?!)
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