The Allison Engine Company's A.G. Covell instructs mechanics from various divisions at the National Advisory Committee for Aeronautics (NACA) Aircraft Engine Research Laboratory on the operation of the Allison More
ALLISON CLASS NASA Identifier: C-1943-3045
ALLISON CLASS NASA Identifier: C-1943-2536 Public domain photograph of NASA research facility, experimental engineering design, free to use, no copyright restrictions image - Picryl description
ALLISON CLASS NASA Identifier: C-1943-2535 Public domain photograph of an official meeting, group of people, managers, directors, discussion, free to use, no copyright restrictions image - Picryl description