(Cameo Corner Cards) John A. Roebling, Civil Engineer, and Manufacturer of Wire Rope, Sash Cord & C. Blue embossed corner card on cover to Pennsylvania, franked with 1851, 3¢ dull red, ample margins to just touching at upper left, tied by "Trenton, N.J., Oct 2" cds; trivial corner nick, Very Fine. Scott No. 11  Estimate $200 - 300. John A. Roebling was the designer of the Brooklyn Bridge as well as inventing and manufacturing steel wire cable, which made the structure possible. $0 (Image)