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Collection of pages from K&E catalogs for the 4180

Fraction Adder

Description:

Catalog page from the 1913 hardbound catalog

K&E 4180 Fraction Adder is a specalized linear slide rule for adding fractions. It is circular in form.

History:

The 4180 was first shown in the 1913 hard bound catalog. It did not appear in the 1913 soft bound catalog. It last appeared in the 1915 catalog.

Scans: Link to scans of 4180s