Don't have Telegram yet? Try it now!
https://golovin2017.com/2016/01/08/publications-2-drilling-tool-bogomolov-preconditions-for-creating-and-using-a-tool-for-blastholes-forming-at-the-open-cast-mining/
Publications #2 – «Drilling tool Bogomolov» - Preconditions for creating and using a tool for blastholes forming at the open cast mining