The object consists of a slide rule and case. The name "D.M.Erikson X" and and O with a vertical slash through it "House B.5974" is written inside the case. On the back D. Erikson is written in black ink.
Keuffel & Esser Company
Donor's ID number for rule
in case: 3/4 in x 6 in x 1 3/4 in; overall: 1/2 in x 5 1/2 in x 1 in