Boyd's directory of Washington, Georgetown and Alexandria (1871)
Washington : Wm. H. Boyd · leaf 330
aw, Mechanical Engineer PEINDLE & DYEB, AINTD ADVOCATED IZV PATENT CAUSES, No. 515 Seventh Street, Especial attention given to Interferences, Extensions, Appeals and Rejected Applications ; to the procnrement of Patents in foreign countries ; to the preparation of Opinions as to the validity of…