More topics under "B64 - Aircraft; Aviation; Cosmonautics" (134,928) |
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B64B - Lighter-than-air aircraft (2,924) |
B64C - Aeroplanes; Helicopters (59,912) |
B64D - Equipment for fitting in or to aircraft; Flying suits; Parachutes; Arrangements or mounting of power plants or propulsion transmissions (47,939) |
B64F - Ground or aircraft-carrier-deck installations (11,337) |
B64G - Cosmonautics; Vehicles or equipment therefor (12,816) |