Grace's Guide

British Industrial History

Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 145,350 pages of information and 230,731 images on early companies, their products and the people who designed and built them.

Christian Reithmann

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The concept of the four-stroke engine was also patented (October 26, 1860) by the Austrian Christian Reithmann.

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