Report of the Commissioner of Patents for the year .. (1849)
United States. Patent Office · Washington : Office of Printers to House of Reps. · leaf 361
355 COMMISSIONEE OF PATENTS. … Claim. — ^The combination of the transverse rocker-lever g, the shaft H, the toothed sector k, and the rack l.^ as applied to the switch, and the main and turnout tracks. Also, in combination with the tootlied sector, the locking-plate o, provided with notches, the same being for the purpose of…
United States. Patent Office · Patents · Agriculture
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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