|
| 7131 | Air express service | |
| 9100 | Air force | |
| 9399 | Air force service club | |
| 7131 | Air freight transport | |
| 7131 | Air passenger transport | |
| 3829 | Air pump manufacturing | |
| 3829 | Air siren manufacturing | |
| 3832 | Air traffic control system and equipment manufacturing | |
| 7131 | Air transport | |
| 5000 | Air-conditioning system installation | |
| 5000 | Air-conditioning system repairing | |
| 3829 | Air-conditioning unit manufacturing | |
| 3845 | Aircraft assembling | |
| 3845 | Aircraft engine manufacturing | |
| 3845 | Aircraft manufacturing | |
| 3845 | Aircraft part manufacturing | |
| 7132 | Aircraft rental | |
| 3845 | Aircraft repairing | |
| 3843 | Air-intake filter, rotor vehicle, manufacturing | |
| 5000 | Airport construction | |
| 7132 | Airport operation | |
| 3845 | Airship manufacturing | |
| 2909 | Alabaster mining or quarrying | |
| 2909 | Alabaster, calcareous, unworked | |
| 3699 | Alabaster, calcareous, worked | |
| 2909 | Alabaster, gypseous, unworked | |
| 3420 | Album manufacturing | |
| 3513 | Alcohol, polyvinyl, manufacturing | |
| 3131 | Alcoholic liquor blending | |
| 3131 | Alcoholic liquor distilling | |
| 3131 | Alcoholic liquor rectifying | |
| 3133 | Ale manufacturing | |
| 3122 | Alfalfa mixed feed manufacturing | |
| 3511 | Alkali manufacturing | |
| 3851 | Alkalinity gauge manufacturing | |
| 3522 | Alkaloid manufacturing | |
| 3513 | Alkyd resin manufacturing | |
| 3720 | Alloyed non-ferrous metal in basic shape and form manufacturing | |
| 3710 | Alloyed steel bar manufacturing | |
| 3710 | Alloyed steel ingot manufacturing | |
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