Explanatory notes
… thereof (strips or panels). (3) Carrier hoops. (4) Ballonets. (5) Rigid frames and sections thereof. … doors, escape chutes and slides, windows, port-holes, etc.). (2) Wings and their components (spars, ribs, cross-members). (3) Control surfaces, whether or not movable (ailerons, slats, spoilers, flaps, …