F.225 Data Sheet MJS-p-0396

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K&E, 9068, 1948-52

Serial Number or Date Stamp: 9920

Country: USA

Primary construction material: pl

Case included?: yes

General Description: Basic linear polyphase duplex 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 L

Back Scales: K A [ B ST S ] D T

Notes: Polyphase Pocket Duplex DORIC rule; early pre-4168 rule, PAT PEND; rare, only made for 2-3 years

References: https://www.mccoys-kecatalogs.com/KEModels/ke4168family.htm

Date Acquired: 09/16/2025