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patents : 269 phrases in 15 subjects |
| Carpentry | 3 |
| Construction | 5 |
| Contracts | 1 |
| Economics | 13 |
| General | 12 |
| Glass production | 2 |
| Law | 196 |
| Medical | 3 |
| Oil / petroleum | 7 |
| Paint, varnish and lacquer | 2 |
| Plasterings | 1 |
| Polygraphy | 13 |
| Stonemasonry | 1 |
| Technology | 9 |
| United States | 1 |