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Circa 1920-50s American Optical Co. (Keuffel & Esser) 6-Inch (15 cm) Boxwood Ruler

In Accessories > Eyeglasses > Show & Tell and Tools and Hardware > Rules and Rulers > Show & Tell.
Rules and Rulers3 of 147Unmarked, Early 24" Wood Ruler with Brass Top EdgeAntique Scale Rule pre 1840, only one of its kind.
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    Posted 9 months ago

    tshusker
    (117 items)

    A very handy 6 inch (15 cm) ruler that probably dates from the 1920s to 50s. Sold by the American Optical Company (founded 1833, incorporated 1869), it was most likely manufactured by Keuffel & Esser. It is solid boxwood with "Ivorite" (ABS plastic), with 16th graduations on one side, and millimeter graduations on the other.

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