The Slide Rule PIC 221 Thornton is a vintage engineering tool from 1951 to the present day, made of plastic and Bakelite material. This collectable slide rule is specifically designed for engineering and surveying purposes, making it a valuable piece for enthusiasts and collectors alike. The original case and instructions book add to the authenticity and usability of this sought-after item, making it a rare and unique find for those interested in scientific collectables.
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