Chicago Pneumatic Tool Co. is best known as a maker of handheld pneumatic power tools (not covered by this site), and they also have made portable electric tools, boring machines, sanding machines, bench grinders, tool post grinders, gas engines, and semi-diesel engines. The company was founded in 1894 by John W. Duntley.

From 1913-01-0 American Machinist

Information Sources

• Wikipedia article Chicago Pneumatic
• 1917 catalog from Machinists Supply Co. of Chicago includes four pages of "Duntley" electric drills, drill stands, portable grinders, and tool post grinders. Duntley was a brand of Chicago Pneumatic Tool Co.
• The Early American Industry Association (EAIA) Directory of American Toolmakers lists this firm as a maker of boring machines, drills, jacks, etc. "The made BOYER and NEW BOYER pneumatic hammers, MANNING sand-papering machines and WHITELAW boring machines, along with riveters, tube rollers/expanders/cutters, jacks, drills, printing machines, etc." The sources have dates of 1896 through 1946.
• American Gasoline Engines Since 1872 by C. H. Wendel, Volume #1, 1983 page 98. Indicate "ca 1915" for this firm's engines.
• The Complete Guide to Stationary Gas Engines by Mark Meincke, 1996 page 105
• A history of Detroit's Dry Dock Engine Works (PDF) has a brief but enlightening passage about the impact of the 1890s introduction of the pneumatic riveter by this firm. Just search the document for "Chicago Pneumatic".
• 1925 brochure advertised on eBay in Aug. 2019 for Giant Semi-Diesel Oil Engines