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The historic boundary between Pennsylvania and Maryland was surveyed, 1763-1767, by Charles Mason and Jeremiah Dixon to settle border disputes between the two Provinces. This section of the Mason-Dixon Line was first surveyed June 26, 1765.
Peach Bottom Slate, first used 1734, is the oldest in America. The first commercial cut having been made 1785 by workmen who were primarily Welsh. At the London Crystal Palace Exposition, 1850, Peach Bottom Slate was judged best in the world.