The Adder
Subtitle: only practical adding machine in the world, the two-wheeled velocipede of figures
Series: Harvard pre-1920 social history/business preservation microfilm project -- 02557
Publisher: [s.n.]
Published: 1869?
Place of publication: [s.l.]
Language: eng
Subjects: Calculators
Other titles: Adder, only practical adding machine in the world.