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- One-Class Era-

The first ten years of the HOPRA Nationals from 1975 through 1984 only featured one car class each year.  There occasionally were a couple drivers class designations, but the cars were the same each year.  However, the rules changed, sometimes significantly, from year to year.  This ranged from full near-unlimited (1975, 1978 & 1979), to various restrictions on magnets and electrical systems.  The in-line G-Plus format was heavily featured in years 1979-1984. 

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