1923 Rotogravure Helicopters de Bothezat Berliner Rotorcraft Aviation Historic XGNB9 dated 1937

dated 1937

This is an original 1901 black and white halftone print of "The Island of Nisida

Alexandria Senna

offered by S

1923 Rotogravure Helicopters de Bothezat Berliner Rotorcraft Aviation Historic XGNB9 dated 1937"Helicopters Which Rise Vertically From Ground" This is an original 1923 sepia rotogravure with three images of two early helicopters: the top and middle helicopter is the invention of Emile and Henry A. Berliner; and the bottom helicopter is the de Bothezat helicopter during a test at Dayton, Ohio. CONDITION This 91+ year old Item is rated Very Fine +++. No creases. No surface rub. No tears. No water damage. There is printing on the verso. Please