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This is a Notable Operational milestone.
The C.30 was a prototype Direct Control Autogiro developed after intial experimental flying with a modified Cierva C.19 Mk V. An excellent description of this aircraft and the 'Direct Control' capability is provided in NACA-AC-196.
Note: The exact date of this milestone fell somewhere in March/April 1933 - 31 Mar 1933 has been used as an approximate date.
Source: "The Rise of the Helicopter", Reginald Brie, FLIGHT 23 January 1953, Page 96
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