This sign is used to indicate that helicopters may be located in the area.

Helicopter, Black and White

This sign is used to indicate that helicopters may be located in the area.

This sign is used to indicate that helicopters may be located in the area.

Helicopter, Color

This sign is used to indicate that helicopters may be located in the area.

This sign is used to indicate that helicopters may be located in the area.

Helicopter, Outline

This sign is used to indicate that helicopters may be located in the area.

This sign is used to indicate that helicopters may be located in the area.

Helicopter, Silhouette

This sign is used to indicate that helicopters may be located in the area.

A flying machine invented by George Cayley. It is an early model of the helicopter.

Cayley's Aerial Screw

A flying machine invented by George Cayley. It is an early model of the helicopter.

An early helicopter concept.

Villard's Helicopter

An early helicopter concept.