|
| 3692 | Autophones (organs with perforated music rolls), manufacturing | |
| 3110 | Autotransformers for switchboards (except telephone switchboards), manufacturing | |
| 3110 | Autotransformers, electric (power transformers), manufacturing | |
| 8519 | Auxiliary nursing services, private practice | |
| 4520 | Avalanche protection, construction | |
| 6720 | Average adjusters | |
| 9233 | Aviaries (bird exibit) | |
| 0122 | Aviaries (e.g., raising parakeet, canary, love birds) | |
| 6303 | Aviation club providing primarily flying field services to general public | |
| 9199 | Aviation club, advocacy | |
| 9241 | Aviation club, recreation | |
| 6220 | Aviation clubs, providing air transportation services to the general public | |
| 5050 | Aviation fuel, retail | |
| 2320 | Aviation fuels, made in petroleum refineries | |
| 0113 | Avocado orchards and farms | |
| 2893 | Awls, manufacturing | |
| 5260 | Awning repair shops | |
| 5234 | Awning shops, retail | |
| 5143 | Awnings (except canvas), wholesale | |
| 1721 | Awnings and canopies, outdoor, made from purchased fabrics | |
| 4530 | Awnings, canopies and shutters, metal, installation | |
| 4530 | Awnings, canvas or fibreglass, installation | |
| 2520 | Awnings, rigid plastic or fibreglass, manufacturing | |
| 2811 | Awnings, sheet metal, manufacturing | |
| 5143 | Awnings, wholesale | |
| 2029 | Axe handles, manufacturing | |
| 2893 | Axes, manufacturing | |
| 3430 | Axle assemblies, differential and rear, automotive, truck and bus, manufacturing | |
| 3430 | Axle bearings, automotive, truck and bus, manufacturing | |
| 5020 | Axle straightening, automotive | |
| 2710 | Axles, rolled or forged, made in steel mills | |
| 0112 | Azaleas farming | |
| 2429 | Azides explosive materials, manufacturing | |
| 2411 | Azine dyes, manufacturing | |
| 2411 | Azo dyes, manufacturing | |
| 2411 | Azobenzene, manufacturing | |
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