Russian patent classifications
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Russia had a system of fifteen 'groups', changing circa the end of 1912 (in terms of dates granted) into a bigger numbered system similar to Germany, the Netherlands, and Scandinavia.
Golubev, 1924, index of patents issued during the period 1909–1917 has "Groups" through 1911 and "Classes" from 1913 onward (again, in terms of dates granted). Patent RU-1909-21180 granted 1912-04-10 is Group V; Patent RU-1909-21459 granted 1912-05-13 is Group V; Patent RU-1910-23976 granted 1913-06-13 is 62b.
One earlier patent has Group III/V; this probably means it belongs to both groups III and V.
References
| Enclosing categories | Patent classification systems |
|---|---|
| Subcategories | RU Group III, RU Group V, RU Group VIII, RU Group XII, RU 46a, RU 62, RU 62a, RU 62b |
| Keywords | Russia |
| Start year | |
| End year |
