westinghouse was one of the founding owners of the radio corporation of america in 1919, and in 1926 rca established the national broadcasting company, a group of 24 radio stations that made up the first radio network in the united states. westinghouse initially owned a 20 percent stake in nbc, and as a result, all of westinghouse's stations became affiliates of nbc's blue network when it was launched on january 1, 1927. most of the blue network's programming originated at wjz, which in 1923 had its license moved to new york city, and its ownership transferred to rca.