Permaglass
In 1948, he started his own company, Permaglass, producing curved and tempered glass for the consumer and automotive markets. Within 3 months, he was producing glass for appliances, and for display cases; within 3 years, Permaglass was a leading manufacturer of glass plates for television sets. As the auto and electronics industries boomed in the 1950s, Permaglass was very successful. McMaster merged Permaglass into Guardian Industries of Detroit, Michigan in 1969, creating the third-largest glass company in the world, and left the company in 1971.
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