1944 Slide Rule manual The Polyphase No. N4053 Keuffel & Esser Co.

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1944 Slide Rule manual The Polyphase No. N4053 Keuffel & Esser Co.:
$4.99

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Approxiamately 90 pages, it\'s a manual for the Polyphase Slide Rule, from 1944 and Keuffel & Esser. The last few pages are advertising other slide rules and an engineering transit. This will be more clear than the digital photo shows.

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1944 Slide Rule manual The Polyphase No. N4053 Keuffel & Esser Co.:
$4.99