Explanatory notes
… : (I) Parts of balloons and dirigibles , such as : (1) Nacelles. (2) Envelopes and parts thereof (strips or … components (spars, ribs, cross-members). (3) Control surfaces, whether or not movable (ailerons, slats, spoilers, … rudders, stabilisers, servo-tabs, etc.). (4) Nacelles, cowlings, engine pods and pylons. (5) …