1: P#15c.7 - Osipov (Т. Осиповъ)
2: P#15c.9 - Protopopov (В. Протопопов)
3: P#15b.8 - Loshkin (Лошкин)
4: P#15b.3 - G. de Millo (Г. де Милло)
5: P#15c.10 - Starikov (Стариков)
6: P#15b.11 - Titov (Титов)
7: P#15c.2 - Heilman or Gelman (Гейльманъ)
8: P#15c.5 - Galtsov (Гальцов)
Hopefully the Russian spelling is correct, Russian cursive is a pain to read.
This link should help with any future difficulties: http://www.banknote.ws/COLLECTION/countries/EUR/RUS/RUS-GENERAL/RUS0015.htm
Edit: Speaking of signatures, the Russian notes severely need updating and clarification regarding them. I’ll attempt to update/fix at least this note over my college’s winter break. Perhaps even consider applying to become a referee for Russian banknotes when I have more time.