Eso was a Czech motorcycle factory producing only racing machines from 1949 until 1964, when it joined Jawa.

ESO was founded by a motorcycle racing driver Jaroslav Simandl, and made bikes in 250, 350, and 500 cc, primarily for speedway, moto-cross and ice racing.

[3] The factory produced a prototype microcar in 1959, The ESO-T-250.

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