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[A Lycoming engine being tested]

Description: Photograph of a Lycoming engine being tested before installation into the XH-40 #1 helicopter.
Date: August 10, 1956
Partner: UNT Libraries Special Collections

[A Lycoming engine being tested]

Description: Photograph of a Lycoming engine being tested before installation into the XH-40 #1 helicopter.
Date: August 10, 1956
Partner: UNT Libraries Special Collections

[Side view of YH-40 #7 in flight]

Description: Photograph of the side view of the YH-40 #7 in Olive Drab paint, in flight over a field.
Date: July 10, 1958
Partner: UNT Libraries Special Collections

[YH-40 #7 Olive Drab hovering]

Description: Photograph of the YH-40 #7 Olive Drab air to air hovering over a field.
Date: July 10, 1958
Partner: UNT Libraries Special Collections

[A Lycoming engine being tested]

Description: Photograph of a Lycoming engine being tested before installation into the XH-40 #1 helicopter.
Date: August 10, 1956
Partner: UNT Libraries Special Collections
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