The Ajax was a French automobile built by the American Briscoe brothers, Benjamin and Frank, between 1913 and 1919. Originally built in Neuilly, it was a 12hp cyclecar with 980? cc 4-cylinder engine with friction drive. It sold for ₤78.

Production continued after the brothers returned to the United States where they built the Argo car, which was similar to the Ajax, differing in the inclusion of a more conventional transmission.

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