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Knives, Scissors, and Rotors to Grind, January 1795. Creator: Giovanni Vendramini.
HRM22A40_293

Knives, Scissors, and Rotors to Grind, January 179...

NASA research into rotor blades. Creator: NASA.
HRM21B20_263

NASA research into rotor blades. Creator: NASA.

Hiller XH-44 Hiller-Copter, 1943-1945. Creator: United Helicopters Incorporated.
HRM21A89_043

Hiller XH-44 Hiller-Copter, 1943-1945. Creator: Un...

Hiller XHOE-1 Hornet, 1940s. Creator: United Helicopters Incorporated.
HRM21A89_044

Hiller XHOE-1 Hornet, 1940s. Creator: United Helic...

Bell 206L-1 LongRanger II "Spirit of Texas", 1982. Creator: Bell Helicopter Textron Inc..
HRM21A89_039

Bell 206L-1 LongRanger II "Spirit of Texas", 1982....

Bell H-13J, ca. 1957. Creator: Bell Helicopter Textron Inc..
HRM21A88_111

Bell H-13J, ca. 1957. Creator: Bell Helicopter Tex...

Rocket Pump, Liquid Fuel, R.H. Goddard, ca. 1938-1941. Creator: Robert Goddard.
HRM21A88_211

Rocket Pump, Liquid Fuel, R.H. Goddard, ca. 1938-1...

'A Many-Bladed Rotor for one of the Queen Mary's low-pressure turbines', 1937. Artist: Unknown.
HRM19D39_286

'A Many-Bladed Rotor for one of the Queen Mary's l...

The Hafner Gyroplane, c1935 (c1937). Artist: Unknown.
HRM19C77_421

The Hafner Gyroplane, c1935 (c1937). Artist: Unkno...

Autogyro, c1920s(?)
HRM19B40_423

Autogyro, c1920s(?)

Autogyro, 20th century
HRM19B41_022

Autogyro, 20th century

A 1974 NSU(Neckarsulm Strickmaschinen Union ) RO 80 viewed from above. Artist: Unknown
HRM19A88_219

A 1974 NSU(Neckarsulm Strickmaschinen Union ) RO 8...