In 1932, Marcus and his son Leonard bought and reorganized Klots, renaming it the General Textile Mills. The Frieders built and purchased several more throwing mills in Maryland, Virginia, West Virginia, and Pennsylvania, making it one of the largest organizations in the silk industry. The Klots Throwing Company Mill at Cumberland, Maryland was listed on the National Register of Historic Places in 2010. The mill at Lonaconing, Maryland operated from 1907 to 1957. By the time Marcus died in 1940 and Leonard assumed the Presidency, the company's ability to weave quality textiles had led to the creation of entirely new and more sophisticated technologies for use in alternative applications.