F.223 Data Sheet MJS-p-0433

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K&E, 4097B, 1939

Serial Number or Date Stamp: 35039

Country: USA

Primary construction material: wd

Case included?: yes

General Description: Basic linear polyphase slide rule

Length of 1 decade = 5 in, and overall scale length = 5 in. The largest physical dimension is 5 in.

Front Scales: DF [ CF CI C ] D

Back Scales:

Notes: Ever There 5-in pocket rule, early version, no logo, nice condition

References: https://www.mccoys-kecatalogs.com/KEModels/ke4097family.htm

Date Acquired: 06/28/2026