Queen Glass - LaVale, Maryland 1935-1961: Kortwright, Nehring, Weaver Inc 1935-1956: Sloan Glass 1956-1968: Sloan Glass - Green Spring, West Virginia 1953-1972: Oglebay Glass 1954-1992 PPG Cumberland Works No. 7 - Constructuted in 1953 by the Pittsburgh Plate Glass Company, the Works No. 7 Plant manufactured plate glass in Cumberland from 1953 to 1981. In 1981, the No. 7 manufacturing facility was shut down and used as a research and development facility until 1992. 1956-1968: Knoche Cut Glass. Tire industry As coal production diminished in the first quarter of the 20th century, idled miners offered a deep bench of a labor force for manufacturers looking to expand. One such company was Kelly-Springfield Tire Company of Akron, Ohio. The deal between Cumberland and Kelly-Springfield was sealed in 1916, when the city offered the company $750,000 in cash, raised through bonds bought by Cumberland citizens, and a 10-year exemption from taxes. Groundbreaking for the plant along the Potomac River across from Ridgeley, West Virginia, began in 1917. The first tire was produced in April 1921. At its peak the company employed well over 2,000 people. The new plant site comprised . Fourteen years later, in 1935, the company was sold to Goodyear Tire & Rubber Company, which operated Kelly-Springfield as a wholly owned subsidiary. Soon after passage of the National Labor Relations Act (NLRA), employees at the Cumberland plant voted in 1937 to formally select the United Rubber Workers of America, Local 26, as their exclusive bargaining representative, though Local 26 had represented many of the workers already in organizing efforts and a strike in 1936. In 1942, the plant briefly switched from making tires to producing munitions for the United States military in support of World War II. By 1943, it reconverted to tire manufacturing to supply U.S. Army vehicles. In the early 1980s, the plant was used by Goodyear to produce bias medium truck tires and bias auto tires. The market for these tires deteriorated, resulting in rounds of layoffs and worker concessions, and Local 26 repeatedly pressed the company to invest money to convert the plant to radial truck tire production, as other plants had, to no avail. In 1986, in the era of corporate raids, British financier Sir James Goldsmith, with assistance from the investment bank Merrill Lynch, attempted a hostile takeover of Goodyear, buying up company stock. To ward off the takeover, Goodyear CEO Robert E. Mercer