Beschreibung : Signed by Robert Rank. Houston special post stamp. The X-1 was the first manned airplane to exceed the speed of sound in level flight and was the first of the so-called X-planes, a series of American experimental rocket planes designated for testing of new technologies and often kept secret.

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X 1 (XS 1) (ROCKETPLANE) · FIRST SUPERSONIC FLIGHT · 50TH ANNIVERSARY