Armstrong Bros. Tool Company

The Armstrong Bros. Tool Company began in 1890 as a maker of bicycle parts and service tools, founded in Chicago, Illinois by five brothers. (Some sources say four brothers, but the ABHB names them as James, George, John, Paul, and Hugh.) Their first manufacturing operations were conducted literally from a backyard wooden shed, and the brothers also operated a retail store for their bicycle parts.

In its final years, it existed as a brand of Apex Tool Group, LLC and manufactured the majority of its tools in the United States, focusing mostly on aerospace, government, and military users.

More info at

• http://alloy-artifacts.org/armstrong-bros.html
• https://en.wikipedia.org/wiki/Armstrong_Tools
• https://www.garagejournal.com/forum/threads/old-armstrong-wrenches.198138/
• https://armstrong-tools.com/Armstrong-Tools.pdf