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Keuffel & Esser Polyphase slide rule
Keuffel & Esser Company
Date: circa 1917
Accessories: Brown leather case with flap closure, for storage.
Object number: 1989-1-0012
Polyphase slide rule
Keuffel & Esser Company
Date: patented 1900
Accessories: brown leather case, for storage
Object number: 2003-1-0225
Polyphase slide rule
Keuffel & Esser Company
Date: patented 1900
Object number: 1997-1-0977