K&E 4081-3 ---- Special Scale Set
This slide rule has no model markings on the right end. The purpose of the special scales on the back side is unknown. Hap Pleasant states that his father obtained it somewhere in Europe in the 1950s.
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Scales r, SI, Ar, and V are log scales to stange powers some with strange offsets. I cannot identify the n scale.
From the presence of the K&E logo and the serial number, it probably dates around 1946-1947.
Scans from Hap Pleasant