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Slide Rule, William J. Powell, ca. 1930s. Creator: Keuffel & Esser Co..
 
Dead reckoning computer owned by Sally Ride. Creator: Telex Communications Inc..
 
Chemical slide rule owned by Sally Ride, ca. 1970. Creator: Keuffel & Esser Co..
 
Mathematical slide rule owned by Sally Ride, ca. 1970. Creator: Frederick Post Co..