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08-29-2002, 12:56 PM
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 | Moderator | | Join Date: May 2001 Location: This Quintessence of Dust
Posts: 6,251
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I was going to say The Marshalltown Trowel, but I see that they were first made in 1893. Drat. 
But really, I might suggest that the U.S. State Highway system of the 1920s drastically changed the face of the United States. Not the whole world, though.
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