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| SECTION B– PERFORMING OPERATIONS; TRANSPORTING |
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| B 64 | AIRCRAFT; AVIATION; COSMONAUTICS |
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| B 64 B | LIGHTER-THAN-AIR AIRCRAFT (ground installations for aircraft in general B 64 F) |
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| B 64 C | AEROPLANES; HELICOPTERS (air-cushion vehicles B 60 V) |
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| B 64 D | EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLYING SUITS; PARACHUTES; ARRANGEMENTS OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS |
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| B 64 F | GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS |
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| B 64 G | COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR (apparatus for, or methods of, winning materials from extraterrestrial sources E 21 C 51/00) |
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