299 A.2d 660, 309 A.2d 193 Duquesne Light Company, Appellant v. Board of Property Assessment, Appeals and Review of Allegheny County, Pennsylvania, Appellee. The American Telephone and Telegraph Company, Appellant v. Board of Property Assessment, Appeals and Review of Allegheny County, Pennsylvania, Appellee. The Bell Telephone Company of Pennsylvania, Appellant v. Board of Property Assessment, […]