American and foreign patents;
A patent-agency handbook issued by George S. Vashon & Co. in Washington, D.C., in 1905, written to instruct American inventors on filing and protecting patents at home and abroad. The illustrations are small numbered line diagrams of mechanical elements — gear trains, cranks, linkages, cams and clamped shafts — drawn in even outline with ruled hatching, useful as compact engineering motifs, spot figures or diagram vocabulary.
