How to obtain a patent and what to invent
A 1918 promotional handbook on patent procedure issued by the Washington, D.C., patent attorneys Talbert & Talbert for inventors seeking to file claims. Halftone photographs in sepia and grey show the firm's offices: clerks at roll-top and flat-top desks, wire letter trays, candlestick telephones, draftsmen at drawing boards, and framed prints on plain walls.
