The Klots Throwing Company was one of the largest silk manufacturers in the United States, incorporated in Pennsylvania in 1894. The business had been founded by Henry Durell Klots (1863-1914) and George Klots (1872-1916), silk throwsters, in New York City in the 1880s. The expansion of the company was largely the work of Marcus Frieder (1860-1940).

Frieder was born in Szinna, Hungary, on February 7, 1860, and demonstrated successful organizational and managerial skills before the age of twenty. In 1890 he emigrated to America and became a bookkeeper for the Klots brothers in New York. The New York mill burned in 1894, and at Frieder's suggestion the business was moved to Carbondale, Pennsylvania. This was part of a general movement of the silk industry into the anthracite and bituminous coal-mining fields, where the wives and daughters of the coal miners formed a large pool of untapped labor.

Frieder became manager of the Carbondale mill and later secretary-general manager of the company. On the death of Henry D. Klots in 1914, he succeeded to the presidency. Under Frieder's management, the Klots Throwing Company became one of the larger silk manufacturers in America. It built additional mills at Archbald, Scranton, and Forest City in the Pennsylvania anthracite region, at Cumberland and Lonaconing in the Maryland bituminous coal fields, and in Virginia and West Virginia.

Frieder helped to organize the Villa-Stearns Company, through which he began to import raw silk from China and Japan. He secured full control of Villa-Stearns in 1916 and changed its name to the General Silk Importing Company, Inc. From 1915 to 1921, the firm was the largest American importer and seller of raw silk.

Frieder expanded into New England in 1917, when he organized the National Spun Silk Company and built the largest spun silk mill in the United States at New Bedford, Massachusetts. He also acquired the General Fabrics Corporation, with a silk weaving mill in Central Falls, Rhode Island, in 1921 and established the General Silk Dyeing Company in New Bedford in 1926. In January 1927 the General Silk Corporation was formed as a holding and sales company for all of Frieder's operations. At its peak, Klots operated fourteen mills, had 6,000 employees, and annual sales of $50 million.

Frieder's business was greatly affected by the rise of rayon as a synthetic textile substitute for silk and, with the collapse of business in the Depression, the firm was forced into bankruptcy in 1932. Marcus Frieder and his son, Leonard Peter Frieder (1895-1972), reorganized the mills at Carbondale, Lonaconing, and Cumberland under the title of General Textile Mills, Inc. As the textile industry migrated southward, the firm absorbed the Hendrick Manufactung Company of Carbondale, a maker of perforated screens and filters founded by Eli E. Hendrick (1832-1909) in 1876. General Textile Mills, Inc., was renamed Gentex Corporation in July 1958 to reflect is new product lines.

Marcus Frieder died in New York on October 13, 1940. Leonard P. Frieder operated the business until his death in 1972.