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James Porter, Copper Plate Printer. Poulson's American Daily Advertiser. Philadelphia, PA. 1818. "Has removed his Copper Plate Prining office to the N. W. corner of Sixth and Chestnut Streets..." Plus a Help Wanted notice for a Journeyman Copper Plate Printer. Before there where halftones, before steel plates, Copper Plates and Wood Engraving held the market for printed illustrations. And a very polite trade it was.