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Corporate Names
- Dow Chemical Company.7
- United States Steel Corporation.3
- Westinghouse Electric & Manufacturing Company. Pittsburgh Division.2
- Allegheny County Steam Heating Company.1
- Buffalo Niagara Electric Corporation.1
- Consolidation Coal Company.1
- Koppers Company.1
- Mountaineer Carbon Company.1
- Ohio Edison Company.1
- Ohio Leather Company.1
- Pittsburgh Coke and Chemical Company.1
- United States Steel Corporation. Clairton Works.1
- United States Steel Corporation. National Tube Division.1
- Universal Atlas Cement Company.1