During an inspection of the Kost Tower Complex in mountainous Ingushetia, ACM Group specialists discovered historic roof tiles bearing the maker's mark "S. Ya. Antsupov Cmn."
Sergey Yakovlevich Antsupov was produced in the village of Troitskaya in the Sunzha District of the Terek Region. Antsupov's brick and tile factory is mentioned in the Terek Calendar for 1904. According to the calendar, the factory's revenue was 300 tsarist rubles and it employed seven people. The Address Book of the Factory and Craft Industry of All Russia for 1907 also lists Antsupov's factory with eight workers.
Based on the production data, it can be assumed that the roof tiles at the factory were most likely produced only for residents of the village of Troitskaya and did not have a wide market.