Keuffel & Esser Polyphase 10" Slide Ruler
10" Keufeel & Esser polyphase slide ruler patented June 5, 1900! Comes with original leather case that is missing top flap. Both ruler and case have wear from age, with some light discoloring on the plastic ruler, and scratches and missing flap on sleeve. Magnifying slide, and middle slide on ruler move with ease. Back of ruler has conversion chart.
Respectfully, all items are sold "AS IS" and have not been tested unless noted in description. Please allow 48hrs to process each order. Thank you!
If you do not need your item shipped enter discount code LOCALPICKUP during check out to waive shipping and pick up at our Piazza location.