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 >>/48498/

Most of courtyard is filled by relatively modern Soviet/Russian artillery though. I've photographed almost everything, but they are too similar to post them all, so there are random selection:

5. M-60 gun, from WW2
6. D-20 that is still used now.
7. 2B1 Oka - one of the last big guns in history. They were experimental ones and weren't produced much, because tactical missiles replaced them.
8. 2S7 Pion. A big gun too, and is still actively used.