National Waterproofing Compnay; Manufacturers of "National Duplex" and Single Coated Waterproof Case Linings; 1054- 1056 Drexel Building, Philadelphia, PA.; Issac Collins, pres. and gen. mgr.; C.W. Collins, secy. and treas.; Letterhead consists of image of large domed building and text
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Letterheads, Philadelphia (Penn.), Pennsylvania