Principles of Longwall Mining | Hacker News

Hacker Newsnew | past | comments | ask | show | jobs | submit

		Principles of Longwall Mining (youtube.com)
		1 point by ganzuul on Aug 31, 2019 \| hide \| past \| favorite \| 2 comments

bradknowles on Sept 1, 2019 [–]

Youtube advertisement for Caterpillar.

ganzuul on Sept 1, 2019 | [–]

Did you watch the entire thing?

Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact