Petersen Mfg Co

Petersen Manufacturing was initially founded around 1923 as the Sire & Petersen Wrench Company in DeWitt, Nebraska. The founders were Jules A. Sire and William Petersen, and the company operated as the maker of “Vise Grip” locking pliers.

More info at

• http://alloy-artifacts.org/petersen-mfg.html
• https://livinghistoryfarm.org/farming-in-the-1940s/machines/vise-grip/
• https://www.irwin.eu/about-us/irwin-history
• https://www.asktooltalk.com/articles/toolhistory/vise-grip.php
• https://en.wikipedia.org/wiki/Locking_pliers