Set of Drafting Instruments, first quarter of the 19th century, a boxed set, with slide rule marked Keuffel & Esser Co. N.Y., two dividers, parallel rule, and a triangle, all housed in a fitted mahogany box, together with a beveled edged parallel rule marked Patent "Hezzanith mark1 Fields Rule, Hills Patent No. 15455, with brass mounts, lg. 17 7/8 in.
Set of Drafting Instruments, first quarter of the 19th century, a boxed set, with slide rule marked Keuffel & Esser Co. N.Y., two dividers, parallel rule, and a triangle, all housed in a fitted mahogany box, together with a beveled edged parallel rule marked Patent "Hezzanith mark1 Fields Rule, Hills Patent No. 15455, with brass mounts, lg. 17 7/8 in.
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
.jpg "Source: Christie's")
.jpg "Source: Christie's")
