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Collection: L. E. Jones

Universal Valve Sizing Rule

A 10″ slide rule with a light green surface (Pickett’s special “eyesaver” design). It is housed in a black coloured sleek leather case. The aluminum…

Fuller’s Spiral Slide Rule

A spiral slide rule, with a 500-inch-long logarithmic scale. Kept in a box labelled “Calculator”, the spiral slide rule essentially consists of two cylinders on…