| 9100 | Army | |
| 9399 | Army service club | |
| 9100 | Army service corps | |
| 2902 | Arsenic mining | |
| 9310 | Art and craft school | |
| 9420 | Art gallery, dealing excluded | |
| 3620 | Art glass manufacturing | |
| 3212 | Art goods stamping for embroidery | |
| 3233 | Art leather work | |
| 3699 | Art marble, manufacturing | |
| 3212 | Art needlework making | |
| 9415 | Art painter, own account | |
| 3610 | Art pottery manufacturing | |
| 3420 | Art printing | |
| 3420 | Art publishing | |
| 9310 | Art school | |
| 9415 | Art sculptor, own account | |
| 9310 | Art teacher, own account | |
| 3903 | Artificial bait, fishing, manufacturing | |
| 3903 | Artificial flies, bait, manufacturing | |
| 3909 | Artificial flower, excluding glass, manufacturing | |
| 3909 | Artificial foliage, excluding glass, manufacturing | |
| 3909 | Artificial fruit, excluding glass, manufacturing | |
| 3909 | Artificial hair curl manufacturing | |
| 3121 | Artificial ice other than dry, manufacturing | |
| 3513 | Artificial ivory manufacturing | |
| 3851 | Artificial kidney manufacturing | |
| 3219 | Artificial leather, not wholly of plastic, manufacturing, | |
| 3851 | Artificial limb manufacturing | |
| 3851 | Artificial respiration apparatus manufacturing | |
| 9331 | Artificial teeth made to order | |
| 3851 | Artificial tubing, for humans, manufacturing | |
| 3909 | Artificial vine, excluding glass, manufacturing | |
| 3909 | Artificial wreath manufacturing | |
| 3829 | Artillery manufacturing | |
| 9415 | Artist, own account | |
| 3909 | Artists' colour in oil manufacturing | |
| 3909 | Artists' colour manufacturing | |
| 3909 | Artists' drawing table and board manufacturing | |
| 3909 | Artists' dry paint manufacturing | |