Prized Lot of retailer Vintage 1940s - 1950s Paper Calculators - Carboloy Tools, Kennametal Carbides, Airco Cutting Guide and Cutting Pressure Chart

A highly collectible 1949 - 1951 lot of paper calculators, including:

• A cardboard double-sided Grade and Speed Selector from Carboloy Company (Detroit, retailer MI). Copyright 1949. 8 1/8" X 5 1/2" in nice condition, with some minor edge wear and rubbing.
• A comprehensive double-sided cardboard calculator from Kennametal Inc. (Latrobe, PA). Calculations are provided for milling feed rates, turning and boring feed and horsepower, RPM and surface speed, hardness conversion and steel cutting speeds. Copyright 1949. 7 1/4" X 3 1/2", in excellent condition, with virtually no wear.
• A cardboard Airco Oxyacetylene Machine Gas Cutting Guide from Air Reduction Company, Incorporated. The face calculates pressure, speed and width of kerf for a Style 124 Tip and Airco 45 Light Preheat High Speed Tip based on the thickness of the steel. Copyright 1951. 7" X 2 9/16", in exceptional condition, with a bit of very light edge wear.
• An Airco cardboard four-page series of charts, including Cutting Pressure, Tip Cleaning Drill Sizes, Welding Pressure and an Airco "45" High Speed Machine Cutting Tip Approximate Guide. c. 1951. 4 3/4" X 2 7/8", in very good condition, with a bumped corner and a few small stains.

We have are offering a number of vintage paper calculator lots: https://www.etsy.com/shop/Snootyparrot?ref=seller-platform-mcnav&search_query=paper+calculator. If you are interested in an individual item or combination of items, please contact us for a quote including combined shipping if appropriate.