Checker Motors Corporation was once one of the most visible automakers in the country. The main reason for this was the Checker Taxi Cab, a commercial vehicle sold until 1981. The Checker Cab was synonymous with the taxi cab industry and there wasn’t another car that competed with it for decades (via Car Throttle).
Checker also sold consumer cars but the main vehicle was the Checker Taxi. The brand sold consumer vehicles for a brief period but the commercial offerings were where the profit was at. The company hung on until 2010 when it was a consultant to other Detroit automakers for two decades.