Revision history of "Robertson, 1909, An Experimental Propeller"

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  • curprev 12:31, 20 October 2020‎ LTA talk contribs‎ 977 bytes +977‎ Created page with "Experimental properller/aircraft model: <blockquote>The design of the propeller shown under test is somewhat novel, being nothing more nor less than two series of revolving b..."
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