The current NBC News Radio digital station is NBC's first step into the all-news radio format since the closure of its ephemeral NBC News & Information Service (NIS), a former analog radio network targeted at FM stations, which lasted only from 1975 till 1977. The original major NBC Radio Network would be purchased by Westwood One a decade later, in 1987, as General Electric, which had acquired NBC's parent company RCA, divested most properties not pertaining to the NBC television network, thus ending its direct participation in the radio business. NBC Radio Network's news operation was merged into the Mutual Broadcasting System, then into Westwood One's then-corporate sibling CBS Radio, and eventually assimilated into the syndicator itself.