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Prior to 1959 students from Charter Oak elementary schools attended Covina Union High School. Construction of Charter Oak High school was started in 1958 by Covina Union. At that time the various districts that fed into Covina Union formed Unified districts, assuming control of their own high schools. Charter Oak High opened in September of 1959 with Junior, Sophomore, and Freshman classes. The first Graduating class was the class of '61. The school colors were silver and black and the mascot was the Lancer.