| Country of Origin | United States |
|---|
Check the listing for details. Keuffel & Esser Co. Slide Rule Manual Polyphase No. 68 2063 K + E. Condition: Used, Made in United States. Listed at 15.00 USD. Keuffel & Esser Co. Slide Rule Manual Polyphase. Manual No. 68 2063. Vintage K + E booklet.
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