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I think what you may be referring to has been termed a "rotary valve" and was in use in 1929 (and perhaps earlier) in 2-stroke Johnson outboard motors. Some of these had an "external" rotary valve which rotated at 1/2 crankshaft speed. Some later models (1930 thru 1950s) had holes through the crankshaft which allowed the timed intake charge into the combustion chambers.
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