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Keuffel & Esser Instruction Manual for Polyphase Duplex Slide Rule

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. This 92-page salmon-colored paperback ...
insider.si.edu

Instruction Manual for Keuffel & Esser Polyphase Duplex Pocket Slide Rule

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. This 70-page booklet was received ...