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One of the signs describing the overall Milestones of Flight gallery. It reads

Milestones of Flight

These air and space craft are milestones in the history of flight. Each marks an important advance in technology or a historic event. They are a tribute to the imagination, skills, and dedication of all men and women who have made flight possible.

	Pioneer 10	Explorer 1 Sputnik 1	Mariner 2 Venus Probe
Bell XP-59A	Gemini IV	North American X-15	Goddard Rockets	Pershing-II Missile, SS-20 Missile