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Slide Rule, William J. Powell, ca. 1930s. Creator: Keuffel & Esser Co..
HRM21A88_458

Slide Rule, William J. Powell, ca. 1930s. Creator:...

Chemical slide rule owned by Sally Ride, ca. 1970. Creator: Keuffel & Esser Co..
HRM21A88_273

Chemical slide rule owned by Sally Ride, ca. 1970....

Large compass from a drafting took kit used by John S. Chase, mid-late 20th century. Creator: Keuffel & Esser Co..
HRM21A78_235

Large compass from a drafting took kit used by Joh...