F.139 Data Sheet MJS-p-0425

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Hemmi, 2664, c.1946

Serial Number or Date Stamp:

Country: JPN

Primary construction material: bb

Case included?: yes

General Description: Basic linear polyphase trig slide rule

Length of 1 decade = 10 in, and overall scale length = 10 in. The largest physical dimension is 10 in.

Front Scales: K DF [ CF CI C ] D A _ L

Back Scales: [ TI1 TI2 SI2 SI1 ]

Notes: pre-MIOJ version; A+L scales on lower front; 11 mm thick; WWII-style rear windows

References: https://web.archive.org/web/20190209180343/http://hemmicat.srtco.us/

Date Acquired: 05/01/2026