Did a lot of research on the topic and decided that the article deserves to be translated for en:WP. The invention is rather old, but severely underused and definitely notable, judging even by the number of English language references alone. "Tsiferov's underground rocket" is the term preferentially used in Russian literature, while in English sources it's mostly referred to as "Rocket drill". I could certainly use the suggestions for categories, too, as I'm pretty much drawing a blank here. Thanks, Wesha (talk) 22:58, 12 June 2012 (UTC) Thank you. Regards, RJH (talk) 20:24, 1 July 2012 (UTC)