

The MK-67 coal clearing system is designed to extract coal inside large cleared faces.
- Categories: Economy, Business & Finance, Science & Technology
- Location: Russia
- Event date: 12.06.1967
- Date published: 12.02.2020
- Author: Nikolai Pashin
- Credit: Sputnik
- Original: A67-18156, 6x6 film
- Media: JPEG, 4676x3543px, 7.9Mb