Made in Milwaukee is a new series about the businesses that sell to the world but call Milwaukee home. We’re shining a spotlight on these iconic companies – their histories and their futures. Year founded: 1921CEO: Mike BauerNumber of employees: About 2,000 worldwide, including about 850 in Milwaukee and Oak Creek There are many sites around Milwaukee that were once home to large, buzzing industrial centers, employing hundreds, sometimes thousands of neighborhood folks, and we lament their shuttering and the effect of that loss on our city and its economy. Most days, however, I drive past one of these sprawling factories that, despite its outward serenity, is anything but quiet inside. Behind the gates is Master Lock, founded in Milwaukee in 1921. Master Lock employs about 450 people – most are members of UAW Local 469 – at its Center Street factory, which I visited recently. Another 400 or so employees work at the company’s new headquarters and research and development center in Oak Creek. About 1,200 work in an assembly plant in Nogales, Mexico, and a warehouse across the border in Arizona. Some jobs that had moved to China in the early 1990s were moved back to Mil...