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Erich E. Abraham patented a rotary steam engine for use in automobiles on June 5, 1973.

Erich E. Abraham Rotary Steam Engine, June 5, 1973, Press Photograph Front Erich E. Abraham Rotary Steam Engine, June 5, 1973, Press Photograph , Reverse

This press photograph is dated July 23, 1973.

Erich E. Abraham Rotary Steam Engine, June 5, 1973, Press Photograph

Summary of U. S. Patent Claims for Erich Abraham's Rotary Steam Engine.

[1]U. S. Patent of Erich E. Abraham, June 5, 1973.

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