K & E merchant's (calculating) slide rule.
Subtitle: A simple description and directions for the use of the slide rule for the merchant, importer, exporter, accountant, manager, mechanic, foreman, and others.
Publisher: Keuffel & Esser co.
Published: 1915
Place of publication: New York; Hoboken, N.J. [etc.]
Language: eng
Number of pages: 12
Subjects: Slide-rule.