Excellent Keuffel & Esser Co. 681608 20 1/2\" slide ruler For Sale -

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Excellent Keuffel & Esser Co. 681608 20 1/2\" slide ruler:
$19.99

Hello, my Father was a ship designer and this was in his desk. I don\'t know the value of this but it\'s in just great condition. I see no damage on it at all. The long green case is superb as well. I believe that this piece is from the 40\'s-50\'s era. ENJOY

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