Indestro Open-box End 3/4 and 5/8 Combination Wrench Chicago USA

Duro Metal Products and Indestro Manufacturing, two companies with common management, were important makers of hand tools during the middle part of the 20th century. In this article we'll look at the company history and their extensive patent and trademark activities, discuss the somewhat complicated issues of tool identification, and of course show lots of examples of their tools. The Duro Metal Products Company and its longtime sister/subsidiary business, Indestro Manufacturing, both had roots dating back to World War I, and Gertrude had been there quite literally from the beginning. Born in Chicago to German immigrant parents in 1895 (maiden name: Gertrude Ksionzek), she got married at 18 to a local businessman named Norris F. McNaught, and was by his side in 1917 when he organized the Duro Metal Products Co. on Ohio Street with another toolmaker named William H. Odlum. More info at

• https://www.madeinchicagomuseum.com/single-post/indestro-duro-metal/
• http://alloy-artifacts.org/duro-indestro.html
• http://progress-is-fine.blogspot.com/2017/12/vanished-tool-makers-indestro-chicago.html