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in subjects: "Helicopters."  
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Aerodrome

Description: Patent for an aerodrome/helicopter with improved wing design.
Date: June 27, 1911
Creator: Snow, Guy
Partner: UNT Libraries Government Documents Department

Aerodrome

Description: Patent for an aerodrome. Illustrations included.
Date: June 6, 1911
Creator: Mayhew, Nathaniel L.
Partner: UNT Libraries Government Documents Department

AUTOMATICALLY BALANCING AEROPLANE

Description: Patent for attaching wings to a car in such a way that the wings will automatically adjust as the car shifts in flight. Detailed description and illustrations are included.
Date: unknown
Creator: Mathiesen, Marius
Partner: UNT Libraries Government Documents Department

Airship

Description: Patent for an airshape. This invention is of a helicopter design. Illustration included.
Date: January 21, 1913
Creator: Darche, James
Partner: UNT Libraries Government Documents Department
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