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The VACUUM ROTOR, built by the Rotor Corporation of America, Dayton Ihio.

A model vacuum engine built to a design patented in 1934 by William Leary (US 2,176,272). The object of his invention was to provide an engine which had a quick stroke in one direction and a slow stroke in the other. Also to provide a valve mechanism which opened slowly and snapped into the closed position.

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