Motor Racing Network - Wikipedia
https://en.wikipedia.org/wiki/Motor_Racing_Network
WEBMotor Racing Network (MRN) is a U.S. radio network that syndicates broadcasts of auto racing events, particularly NASCAR. MRN was founded in 1970 by NASCAR founder Bill France, Sr. and broadcaster Ken Squier, and is a wholly owned subsidiary of NASCAR. Its first broadcast was the 1970 Daytona 500.
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