MentatGhola,
i've made some inquiries about the current proprietor of the '12 chairs'.
It seems like all movies made by TO Ekran (the Soviet film company that produced '12 chairs') before Jan. 15, 1990 now belong to ГУ Гостелерадиофонд (Gosteleradiofond state enterprise). See their contacts at
http://www.yellowpages.ru/rus/nd2/qu...924690/ru15606.
I guess, that would be a way to start with.
Regards,
Andrey.