Slide rule manufactured by Keuffel & Esser of New York, model 4088–2, measuring 10″ long and 1.25″ wide, engraved with a serial number of 90947, signed on the three sliding strips in black felt tip by Kranz. Includes the original brown leather case. In fine condition, with light soiling and rubbing, and some irregular ink adhesion to the signature. The Leon Ford Collection. Pre-certified Zarelli Space Authentication.
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