Jergens Pnen-Oil Cylinder Calculator Slide Rule
This is a very nice vintage slide rule type calculator, design to give the user a choice of various type of cylinder clamping types and pressures. It also has some other charts and diagrams on it, regarding types of clamping components and cylinders. Simple to use, in very good used condition, with very little wear. It is marked "JERGENS INC. PNEN-OIL CLEVELAND OHIO 44110". It is 8" long overall. It is made of a plastic coated heavy paper and is very durable. We generally have many different types of slide rules, and slide rule calculators in stock. Many of these calculators have become rare, and very collectible!
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