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Verbesserungs
| Verbesserungs- | |
| law | рационализаторский |
| |||
| рационализаторский | |||
| Verbesserungs: 12 phrases in 10 subjects |
| Agriculture | 2 |
| Astronomy | 2 |
| Construction | 1 |
| Economy | 1 |
| General | 1 |
| Geophysics | 1 |
| Germany | 1 |
| Law | 1 |
| Municipal planning | 1 |
| Zootechnics | 1 |