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K&E 4165 Urea Index Slide rule
This slide rule is a specail function rule built on a Mannheim frame. The rule is best described on page 246 of the K&E full line catalog from 1921. This rule is only shown in the 1921, 1922, and 1925 catalogs.
These scans are from the collection of Clark McCoy
Front side and case:
Back side of rule and slide:
Top edge of rule
Bottom edge of rule
Left end of rule
