My Grandfather owned a Keuffel & Esser Co. Slide Rule 4092-3. There is a patent date of December 22, 1908 on it. It seems pretty old. I wish we had talked about it when he was alive. I bet there were some interesting stories involved...
Keuffel & Esser Co. Slide Rule 4092-3
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This page contains a single entry by Mark Hamzy published on April 24, 2010 4:30 PM.
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