Check the listing for details. Vintage K&E Polyphase Duplex Slide Rule With Leather Case & Manuals. Condition: Used. Listed at 49.99 USD. The manuals are for the K&E Polyphase Duplex Decitrig and the Log Log Duplex Decitrig slide rules. The slide rule is a Log Log Duplex Decitrig model, which was one of the later models in this family of rules.
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